IMMUNOLOGICALLY SIGNIFICANT HERPES SIMPLEX VIRUS ANTIGENS AND METHODS FOR IDENTIFYING AND USING SAME

Abstract: The invention provides HSV antigens that are useful for the prevention and treatment of HSV infection. Disclosed herein are epitopes confirmed to be recognised by T-cells derived from herpetic lesions. T-cells having specificity for antigens of the invention have demonstrated cytotoxic activity against cells loaded with virally-encoded peptide epitopes, and in many cases, against cells infected with HSV. The identification of immunogenic antigens responsible for T-cell specificity provides improved anti-viral therapeutic and prophylactic strategies. Compositions containing antigens or polynucleotides encoding antigens of the invention provide effectively targeted vaccines for prevention and treatment of HSV infection.

Description: IMMUNOLOGICALLY SIGNIFICANT HERPES SIMPLEX VIRUS ANTIGENS AND METHODS FOR IDENTIFYING AND USING SAME The invention disclosed herein was made with government support under Grant Nos. AI34616, AI30731 and CA70017, awarded by the National Institutes of Health. The government has certain rights in this invention. This application claims the benefit of U.S. provisional patent applications number 60/157,181, filed September 30, 1999, number 60/203,660, filed May 12, 2000, and number 60/218,104, filed July 13, 2000, the entire contents of each of which are incorporated herein by reference. Throughout this application various publications are referenced The disclosures of these publications in their entireties are hereby incorporated by reference into this application in order to describe more fully the state of the art to which this invention pertains. TECHNICAL FIELD OF THE INVENTION The invention relates to molecules, compositions and methods that can be used for the treatment and prevention of HSV infection. More particularly, the invention identifies epitopes of HSV proteins that can be used for the development of methods, molecules and compositions having the antigenic specificity of HSV-specific T cells, and in particular, of CD8+ T cells. BACKGROUND OF THE INVENTION Cellular immune responses are required to limit the severity of recurrent HSV infection in humans. Initial genital HSV-2 infections are prolonged and severe, while recurrences are less severe and more frequendy asymptomatic. Resolution of primary HSV-2 infection is associated with infiltration of antigen-specific T cells, including CD8+ cytotoxic T lymphocytes (CTLs). Serial lesion biopsy studies of recurrent HSV-2 infection in humans has shown a shift to CD8+ predominance as lesions mature and correlation of local CTL activity with virus clearance (Koelle, DM et al., J. Clin. Invest. 1998, 101:1500-1508; Cunningham, AL et al., J. Clin. Invest. 1985, 75:226-233). Thus, HSV antigens recognized by CD8+ CTL can be used for novel therapies and vaccines. The complete DNA sequence of herpes simplex virus (HSV) is approximately 150 kb and encodes about 85 known genes, each of which encodes a protein in the range of 50- 1000 ammo acids in length. Unknown are the lmmunogenic epitopes within these proteins, each epitope approximately 9-12 ammo acids in length, that are capable of eliciting an effective T cell immune response to viral infection There remains a need to identify specific epitopes capable of eliciting an effective immune response to HSV infection. Such information can lead to the identification of more effective lmmunogenic antigens useful for the prevention and treatment of HSV infection SUMMARY OF THE INVENTION The invention provides HSV antigens, polypeptides comprising HSV antigens, polynucleotides encoding the polypeptides, vectors, and recombinant viruses containing the polynucleotides, antigen-presenting cells (APCs) presenting the polypeptides, immune cells directed against HSV, and pharmaceutical compositions. The pharmaceutical compositions can be used both prophylactically and therapeuticaUy The antigens of the invention are recognized by T cells recovered from herpetic lesions. The invention additionally provides methods, including methods for preventing and treating HSV infection, for killing HSV-infected cells, for inhibiting viral replication, for enhancing secretion of antiviral and/or lrnmunomodulatory lymphokines, and for enhancing production of HSV-specific antibody For preventing and treating HSV infection, for enhancing secretion of antiviral and/or lrnmunomodulatory lymphokines, for enhancing production of HSV-specific antibody, and generally for stimulating and/or augmenting HSV-specific immunity, the method comprises administering to a subject a polypeptide, polynucleotide, recombinant virus, APC, immune cell or composition of the invention. The methods for killing HSV-infected cells and for inhibiting viral replication comprise contacting an HSV-infected cell with an immune cell of the invention. The immune cell of the invention is one that has been stimulated by an antigen of the invention or by an APC that presents an antigen of the invention. A method for producing such immune cells is also provided by the invention. The method comprises contacting an immune cell with an APC, preferably a dendritic cell, that has been modified to present an antigen of the invention. In a preferred embodiment, the immune cell is a T cell such as a CD4+ or CD8+ T cell. In one embodiment, the invention provides a composition comprising an HSV polypeptide. The polypeptide comprises an ICPO or U L 47 protein or a fragment thereof. In one embodiment, the fragment comprises amino acids 92-101 of ICPO or a substitutional variant thereof. In other embodiments, the fragment comprises amino acids 289-298, 548-557, 550-559, 551-559 and/or 551-561 of U L 47 or a substitutional variant thereof. Also provided is an isolated polynucleotide that encodes a polypeptide of the invention, and a composition comprising the polynucleotide. The invention additionally provides a recombinant virus genetically modified to express a polynucleotide of the invention, and a composition comprising the recombinant virus. In preferred embodiments, the virus is a vaccinia virus, canary pox virus, HSV, lentivirus, retrovirus or adenovirus. A composition of the invention can be a pharmaceutical composition. The composition can optionally comprise a pharmaceutically acceptable carrier and/or an adjuvant. The invention additionally provides a method of identifying an lmmunogenic epitope of an infectious organism, such as a virus, bacterium or parasite. Preferably, the infectious organism is a virus, such as HSV. In one embodiment, the method comprises preparing a collection of random fragments of the organismal genome. The fragments can be prepared using any of a variety of standard methods, including, but not limited to, digestion with restriction enzymes and mechanical fragmentation, such as by controlled sonication (Mougneau E et al., Science 1995, 268:563-66). In a preferred embodiment, the organism is HSV-2 and the fragments of viral genome are prepared by digestion with Sau3Λ I. Examples of other restriction enzymes that can be used include, but are not limited to, Apa I, Sma I, and Alu I. The fragments of genomic DNA are then ligated into a vector, preferably by using a partial fiU-in reaction. A preferred vector is a member of the pcDNA3.1 (+) his series The fragments are then expressed using conventional techniques. Preferably, the expression is performed using a Cos-7 transfection method (De Plaen E et al. In: Lefkowits I, ed. Immunology Methods Manual, v. 2. New York: Academic Press, 1997:691-718). The Cos-7 cells can be co-transfected with an appropriate HLA molecule capable of presenting the target antigen. The ability of the expressed polypeptide to elicit a cellular immune response is then assayed. Ability to elicit a cellular immune response is indicative of the presence of an lmmunogenic epitope. Assays that can be used to detect ability to elicit a cellular immune response include, but are not limited to, cytotoxicity assays and lymphokine secretion assays. In one embodiment, the assay is an interferon-gamma assay. In a preferred embodiment, the invention provides a method for identifying HSV epitopes immunogemc for CD8+ T cells The method comprises obtaining CD8+ T cells from an HSV lesion, and assaying the obtained T cells to identify T cells having ability to recognize HSV-infected cells. The method further comprises obtaining and fragmenting a nucleic acid preparation from HSV, expressing one or more fragments of the obtained nucleic acid, and assaying the expressed fragments for antigenic reactivity with the identified HSV-specific T cells. An expressed fragment having reactivity with the HSV-specific T cells is identified as encoding an HSV epitope immunogemc for CD8+ T cells. The above steps can be repeated with subfragments of the genome fragments. The method can further comprise sequencing a fragment of the genome. In one embodiment, the assaying of T cells comprises performing a cytotoxicity assay or an interferon-gamma assay. The assaying can be performed with an immune cell derived from a subject that has been exposed to the infectious organism. In preferred embodiments, the cell is derived from a site of active infection, such as skin or cervix, or from blood of an infected subject. The invention further provides immunogemc epitopes identified by the method of the invention, polypeptides comprising the epitopes, and polynucleotides encoding the polypeptides. Suitable infectious organisms include bacteria, parasites and viruses. Examples of viruses include DNA and RNA viruses, both double-stranded and single- stranded. The method of the invention provides a strategy for combating a variety of infectious organisms, including those that exhibit significant variability, as knowledge of the organism's nucleic acid sequence is not required. BRIEF DESCRIPTION OF THE FIGURES Figure 1A shows fluorescence detection of TCR Cβ-Vβ PCR products (12 of 24 Vβ families shown) in bulk CD8-ennched PBMC from subject RW. Two Vβ primers (indicated) were used per panel in duplex analysis. X axis: molecular weights of PCR products shown at TOP based on fluorescent markers. Y axis: relative fluorescence intensity. Figure IB shows fluorescence detection of TCR Cβ-Vβ PCR products (12 of 24 Vβ famihes shown) in bulk CD8-ennched lesion-infiltrating lymphocytes (LIL) from primary HSV-2 biopsy. Two Vβ primers (indicated) were used per panel in duplex analysis. X axis: molecular weights of PCR products shown at TOP based on fluorescent markers. Y axis: relative fluorescence intensity. Figure 2A shows pro ferative responses of bulk-expanded cervical cytobrush- derived lymphocytes. Figure 2B shows cytotoxic responses of bulk-expanded cervical cytobrush-denved lymphocytes, plotted as percent specific release. Figure 3 is a schematic representation of the positive genomic clone isolated from Sa 3A I library of HSV-2 DNA (second line), which contained part of the ICPO gene. The genomic clone was transfected into cells and primer A used for cDNA synthesis. The exon-l /exon2 C-A (fifth line) and HLA B45 cDNAs stimulated interferon-gamma secretion from T cell clone (TCC) RW51 after transfection into Cos-7 cells. Exon-1 B-C cDNA (fourth line) was negative. Figure 4 is a bar graph showing CTL activity of RW51 against vaccinia ICPO and indicated concentrations of synthetic ICPO 92-105. Four-hour 51 Cr release assay with effector.target ratio 10:1. Spontaneous release all <20% Figure 5 is a graph showing CTL activity of RW51 against indicated concentrations of synthetic ICPO 92-101. Four-hour 51 Cr release assay with effector:target ratio 10:1. Spontaneous release all <20%. Figure 6 is a graph showing CTL activity of lymphocytes subject RW, derived from peripheral blood and stimulated with a peptide of HSV-2 ICPO amino acids 92-101. Four-hour 51 Cr release assay with effector: target ratio of 10:1 Spontaneous release <20%. For each pair of bars, the upper bar represents data from a lesion-derived CD8 clone and the lower bar represents data from PBMC stimulated with peptide. Figure 7 shows confirmation of HLA restricting allele, HSV-2 reactivity, and IFN- gamma secretion by lesion CD8 clones Figure 8A shows peptide dose-response for lesion CD8 clone dkRW.1991.22 worked up by expression cloning. Figure 8B shows peptide dose-response for lesion CD8 clone RW.1997.51 worked up by expression cloning. Figure 8C shows peptide dose-response for lesion CD8 clone HV.1999.23 worked up by expression cloning Figure 9 shows that A*0201 restricted, U L 47 289-298-specific CD8 CTL cross-react with B*4402 or B*4403. Figures 10A-O show the presence of UL47-specιfic CTL in peripheral blood lymphocytes. Figure 10A shows specific release for subject 1874 ehcited by UL47 289-298. Figure 10B shows specific release for subject 1874 ehcited by UL47 551 -559. Figure 10C shows specific release for subject 1874 ehcited by gB2 443-451. Figure 10D shows specific release for subject 7282 ehcited by UL47 289-298. Figure 10E shows specific release for subject 7282 ehcited by UL47 551-559. Figure 10F shows specific release for subject 7282 ehcited by gB2 443-451. Figure 10G shows specific release for subject 9107 ehcited by U 47 289-298. Figure 10H shows specific release for subject 9107 ehcited by UL47 551-559. Figure 101 shows specific release for subject 9107 ehcited by gB2 443-451. Figure 10J shows specific release for subject 9383 ehcited by UL47 289-298. Figure 10K shows specific release for subject 9383 ehcited by UL47 551-559. Figure 10L shows specific release for subject 9383 ehcited by gB2 443-451. Figure 10M shows specific release for subject 9410 ehcited by Uι 47 289-298. Figure I ON shows specific release for subject 9410 ehcited by UL47 551 -559. Figure 10O shows specific release for subject 9410 ehcited by gB2 443-451. Figure 11A is a graph showing results of an IFN-gamma ELISPOT assay, in ELISPOTS per well, as a function of peptide concentration (μg/ml). Results are shown for 5 9-mer UL47 peptides tested: 548-556 (solid circles); 549-557 (open circles); 550-558 (sohd triangles); 551-559 (open triangles); 552-560 (squares). Figure 1 IB is a graph showing results of an IFN-gamma ELISPOT assay, in ELISPOTS per well, as a function of peptide concentration (μg/ml). Results are shown for 5 10-mer UL47 peptides tested: 548-557 (sohd circles); 549-558 (open circles); 550-559 (sohd triangles); 551 -560 (open triangles); 552-561 (squares). Figure 12 is a bar graph showing results of an IFN-gamma ELISPOT assay, in ELISPOTS per well, for each of various HPLC fractions of peptides eluted from HLA-A2 on C1R-A2/3D9.6H7 cells. The results show that fractions 17, 18 and 23 contain peptides that are recognized by CTL clone cpRW22. The inset shows data for various controls, including T cells alone, C1R-A2/3D9.5A1, C1R-A2/3D9.6H7, C1R-A2/HSV-2, C1R-A2/HSV-1 , and C1R-A2. Figure 13A is a bar graph showing results of an IFN-gamma ELISPOT assay, in ELISPOTS per well, for each of various HPLC subfractions of fraction 17. The results show that subfractions of fraction 17 contain peptides from C1RA2/3D9.6H7 that are recognized by CTL clone cpRW22. Arrows indicate peptides corresponding to SEQ ID NO: 3, 1 and 2, respectively. Figure 13B is a bar graph showing results of an IFN-gamma ELISPOT assay, in ELISPOTS per well, for each of various HPLC subfractions of fraction 18. The results show that subfractions of fraction 18 contain peptides from C1R- A2/3D9.6H7 that are recognized by CTL clone cpRW22. Arrows indicate peptides corresponding to SEQ ID NO- 3, 1 and 2, respectively. Figure 13C is a bar graph showing results of an IFN-gamma ELISPOT assay, in ELISPOTS per well, for each of various controls: clone 22 only; C1R-A2/3D9.5A1; C1R-A2/3D9.6H7; and T2 cells. Figure 14 is a bar graph showing results of an IFN-gamma ELISPOT assay, in ELISPOTS per well, for each of various HPLC subfractions of fraction 23 from C1R-A2/3D9.6H7 cells. The results show that subfraction 37 sensitizes T2 cells for recognition by CTL clone cpRW22. The activity in this fraction has the same mobility on HPLC as UL47/550-559. Arrows indicate peptides corresponding to SEQ ID NO: 3, 1 and 2, respectively. The inset shows data for controls, including T cells alone and C1R-A2/3D9.6H7. Figure 15A shows the results of HPLC fractionation of HSV2 synthetic peptide LGLADTWAC (SEQ ID NO: 1; U L 47/550-559). The peptide was run through HPLC under the subfractionation conditions and found to elute in fraction 37. Figure 15B shows the results of HPLC fractionation of HSV2 synthetic peptide GLADTWACV (SEQ ID NO: 2; U L 47/551-560). The peptide was run through HPLC under the subfractionation conditions and found to elute in fraction 40/41. Figure 15C shows the results of HPLC fractionation of HSV2 synthetic peptide GLADTWAC (SEQ ID NO: 3; U L 47/551-559). The peptide was run through HPLC under the subfractionation conditions and found to elute in fraction 32 Figure 16 shows mass spectra data, plotted as relative abundance as a function of m/z, for fraction 23/subfraction 37 from C1R-A2/3D9.6H7. These data show that a peptide with the same mass (MW = 961) as U L 47/550-559 IS present in this subfraction. Figure 17 shows the sequences (SEQ ID NO: 14-17) of various primers used for PCR to demonstrate that the C1R-A2/3D9.6H7 cells contain at least two retroviral inserts derived from HSV-2. Figure 18A shows the results of the PCR analysis of retroviral inserts from C1R- A2/3D9.6H7 cells, confirming that these cells contain inserts from HSV-2. Bands 2, 4 and 8 refer to the portions of the UL47 insert illustrated in Figure 18B; band 7 refers to the U L 52 insert illustrated in Figure 18C. Figure 18B is a schematic illustration of the large portion of the UL47 gene encoded by a retroviral insert from C1R-A2/3D9.6H7 cells. This insert includes a portion encoding the U L 47/550-559 peptide (SEQ ID NO: 1). Figure 18C is a schematic illustration of the two fragments of the U L 52 gene encoded by a second retroviral insert from C1R-A2/3D9.6H7 cells. Figure 19 is a bar graph showing that UL47 gene-transfected VA13/A2 cells are recognized by CD8+ T cell clone cpRW22, as determined by interferon-gamma secretion measured in ELISPOTS /well. Targets were VA13 fibroblasts stably expressing HLA-A2. Targets were pulsed with U L 47 peptide or transiently transfected with UL47 expression plasmid clones #2, #4 or #6. Responders were the cpRW22 CD8+ T cell clone. Figures 20A-L are graphs showing CTL responses by different HLA-A2 donors, plotted as percent specific lysis as a function of effector:target ratio. Targets were pulsed with either no peptide (sohd circles), the stimulating peptide (open circles), or a control peptide derived from HIV (triangles). Figure 20A shows results for donor RW1874. PBMC were stimulated with influenza Ml /58-66. Figure 20B shows results for donor RW1874. PBMC were stimulated with U L 47/550-559. Figure 20C shows results for donor RW1874. PBMC were stimulated with U 47/289-298. Figure 20D shows results for donor HV5101. PBMC were stimulated with Ml /58- 66. Figure 20E shows results for donor HV5101. PBMC were stimulated with U L 47/550-559. Figure 20F shows results for donor HV5101. PBMC were stimulated with U L 47/289-298. Figure 20G shows results for donor AD120. PBMC were stimulated with Ml /58-66. Figure 20H shows results for donor AD120. PBMC were stimulated with U L 47/550-559. Figure 201 shows results for donor AD120. PBMC were stimulated with UL47/289- 298. Figure 20J shows results for donor AD124. PBMC were stimulated with Ml/58-66. Figure 20K shows results for donor AD 124. PBMC were stimulated with U L 47/550-559. Figure 20L shows results for donor AD 124. PBMC were stimulated with U L 47/289- 298. DETAILED DESCRIPTION OF THE INVENTION The invention provides HSV antigens that are useful for the prevention and treatment of HSV infection. Disclosed herein are antigens and/or their constituent epitopes confirmed to be recognized by T-cells derived from herpetic lesions. In some embodiments, T-cells having specificity for antigens of the invention have demonstrated cytotoxic activity against virally infected cells. The identification of immunogemc antigens responsible for T-cell specificity facilitates the development of improved antiviral therapeutic and prophylactic strategies. Compositions containing antigens or polynucleotides encoding antigens of the invention provide effectively targeted vaccines for prevention and treatment of HSV infection. Definitions All scientific and technical terms used in this application have meanings commonly used in the art unless otherwise specified As used in this application, the following words or phrases have the meanings specified. As used herein, "polypeptide" includes proteins, fragments of proteins, and peptides, whether isolated from natural sources, produced by recombinant techniques or chemically synthesized. Polypeptides of the invention typically comprise at least about 6 amino acids. As used herein, "HSV polypeptide" includes HSV-1 and HSV-2, unless otherwise indicated. References to amino acids of HSV proteins or polypeptides are based on the genomic sequence information regarding HSV-2 as described in A. Dolan et al., 1998, J. Virol. 72(3):2010-2021. As noted below, the predicted polypeptide sequence of ICPO of HSV-2 based on sequencing RNA from cells transfected with a fragment of ICPO differs from the published sequence by the omission of amino acid Q26. As used herein, "substitutional variant" refers to a molecule having one or more amino acid substitutions or deletions in the indicated amino acid sequence, yet retaining the ability to be specifically recognized by an immune cell. The amino acid sequence of a substitutional variant is preferably at least 80% identical to the native amino acid sequence, or more preferably, at least 90% identical to the native amino acid sequence. One method for determining whether a molecule can be specifically recognized by an immune cell is the cytotoxicity assay described in D.M. Koelle et al., 1997, Human Immunol. 53:195-205. Other methods for determining whether a molecule can be specifically recognized by an immune cell are described in the examples provided hereinbelow, including the ability to stimulate secretion of interferon-gamma or the ability to lyse cells presenting the molecule. An immune cell will specifically recognize a molecule when, for example, stimulation with the molecule results in secretion of greater interferon-gamma than stimulation with control molecules. For example, the molecule may stimulate greater than 5 pg/ml, or preferably greater than 10 pg/ml, interferon- gamma secretion, whereas a control molecule will stimulate less than 5 pg/ml interferon- gamma. As used herein, "vector" means a construct, which is capable of delivering, and preferably expressing, one or more gene(s) or sequence(s) of interest in a host cell. Examples of vectors include, but are not limited to, viral vectors, naked DNA or RNA expression vectors, plasmid, cosmid or phage vectors, DNA or RNA expression vectors associated with cationic condensing agents, DNA or RNA expression vectors encapsulated in liposomes, and certain eukaryotic cells, such as producer cells. As used herein, "expression control sequence" means a nucleic acid sequence that directs transcription of a nucleic acid. An expression control sequence can be a promoter, such as a constitutive or an lnducible promoter, or an enhancer. The expression control sequence is operably linked to the nucleic acid sequence to be transcribed. The term "nucleic acid" or "polynucleotide" refers to a deoxyπbonucleotide or ribonucleotide polymer in either single- or double-stranded form, and unless otherwise limited, encompasses known analogs of natural nucleotides that hybridize to nucleic acids in a manner similar to naturally occurring nucleotides. As used herein, "antigen-presenting cell" or "APC" means a cell capable of handling and presenting antigen to a lymphocyte. Examples of APCs include, but are not limited to, macrophages, Langerhans-dendπtic cells, foUicular dendritic cells, B cells, monocytes, fibroblasts and fibrocytes. Dendritic cells are a preferred type of antigen presenting cell. Dendritic cells are found in many non-lymphoid tissues but can migrate via the afferent lymph or the blood stream to the T-dependent areas of lymphoid organs In non- lymphoid organs, dendritic cells include Langerhans cells and interstitial dendntic cells. In the lymph and blood, they include afferent lymph veiled cells and blood dendritic cells, respectively In lymphoid organs, they include lymphoid dendntic cells and lnterdigitating cells. As used herein, "modified" to present an epitope refers to antigen-presenting cells (APCs) that have been manipulated to present an epitope by natural or recombinant methods. For example, the APCs can be modified by exposure to the isolated antigen, alone or as part of a mixture, peptide loading, or by genetically modifying the APC to express a polypeptide that includes one or more epitopes. As used herein, "pharmaceutically acceptable salt" refers to a salt that retains the desired biological activiti. of the parent compound and does not impart any undesired toxicological effects. Examples of such salts include, but are not limited to, (a) acid addition salts formed with inorganic acids, for example hydrochloric acid, hydrobromic acid, sulfuπc acid, phosphoric acid, nitric acid and the like; and salts formed with organic acids such as, for example, acetic acid, oxalic acid, tartaric acid, succinic acid, maleic acid, furmaric acid, glucomc acid, citric acid, malic acid, ascorbic acid, benzole acid, tannic acid, pamoic acid, alginic acid, polyglutamic acid, naphthalenesulfonic acids, naphthalenedisulfonic acids, porygalacturonic acid; (b) salts with polyvalent metal cations such as zinc, calcium, bismuth, barium, magnesium, aluminum, copper, cobalt, nickel, cadmium, and the like; or (c) salts formed with an organic cation formed from N,N'- dibenzylethylenediamine or ethylenediamine; or (d) combinations of (a) and (b) or (c), e.g., a zinc tannate salt; and the like. The preferred acid addition salts are the tnfluoroacetate salt and the acetate salt. As used herein, "pharmaceutically acceptable carrier" includes any material which, when combined with an active ingredient, allows the ingredient to retain biological activity and is non-reactive with the sub j ect's immune system Examples include, but are not limited to, any of the standard pharmaceutical carriers such as a phosphate buffered saline solution, water, emulsions such as oil/water emulsion, and various types of wetting agents. Preferred diluents for aerosol or parenteral administration are phosphate buffered saline or normal (0.9%) saline. Compositions comprising such earners are formulated by well known conventional methods (see, for example, Remington's Pharmaceutical Sciences, Chapter 43, 14th Ed., Mack Publishing Co, Easton PA 18042, USA). As used herein, "adjuvant" includes those adjuvants commonly used in the art to facilitate the stimulation of an immune response. Examples of adjuvants include, but are not limited to, helper peptide; aluminum salts such as aluminum hydroxide gel (alum) or aluminum phosphate; Freund's Incomplete Adjuvant and Complete Adjuvant (Difco Laboratones, Detroit, MI); Merck Adjuvant 65 (Merck and Company, Inc., Rahway, NJ); AS-2 (Smith-Kkne Beecham); QS-21 (Aquilla); MPL or 3d-MPL (Conxa Corporation, Hamilton, MT); LEIF; salts of calcium, iron or zinc; an insoluble suspension of acylated tyrosine; acylated sugars; cationically or anionically denvatized polysacchandes; polyphosphazenes; biodegradable microspheres; monophosphoryl hpid A and quil A; muramyl ti peptide phosphatidyl ethanolamine or an lmmunostimulating complex, including cytokines (e.g., GM-CSF or ιnterleukιn-2, -7 or —12) and lrnmunostirnulatory DNA sequences. In some embodiments, such as with the use of a polynucleotide vaccine, an adjuvant such as a helper peptide or cytokine can be provided via a polynucleotide encoding the adjuvant. As used herein, "a" or "an" means at least one, unless clearly indicated otherwise. HSV Polypeptides In one embodiment, the invention provides an isolated herpes simplex virus (HSV) polypeptide, wherein the polypeptide compnses an ICPO or U L 47 protein or a fragment thereof. In one embodiment, the fragment compnses amino acids 92-101 of ICPO or a substitutional vanant thereof. In another embodiment, the fragment compnses amino acids 289-298, 548-557, 550-559, 551-559 and/or 551-561 of U L 47 or a substitutional variant thereof. The reference to amino acid residues is made with respect to the proteins of the HSV-2 genome as descnbed in A. Dolan et al, 1998, J. Virol. 72(3):2010- 2021. The polypeptide can be a fusion protein. In one embodiment, the fusion protein is soluble. A soluble fusion protein of the invention can be suitable for injection into a subject and for eliciting an immune response Within certain embodiments, a polypeptide can be a fusion protein that comprises multiple polypeptides as descnbed herein, or that compnses at least one polypeptide as descnbed herein and an unrelated sequence. A fusion partner may, for example, assist in providing T helper epitopes (an lmmunological fusion partner), preferably T helper epitopes recognized by humans, or may assist in expressing the protein (an expression enhancer) at higher yields than the native recombinant protein. Certain preferred fusion partners are both lmmunological and expression enhancing fusion partners. Other fusion partners may be selected so as to increase the solubility of the protein or to enable the protein to be targeted to desired lntracellular compartments. Still further fusion partners include affinity tags, which facilitate punfication of the protein. Fusion proteins may generally be prepared using standard techniques, including chemical conjugation. Preferably, a fusion protein is expressed as a recombinant protein, allowing the production of increased levels, relative to a non-fused protein, in an expression system. Bnefly, DNA sequences encoding the polypeptide components may be assembled separately, and hgated into an appropnate expression vector. The 3' end of the DNA sequence encoding one polypeptide component is hgated, with or without a peptide linker, to the 5' end of a DNA sequence encoding the second polypeptide component so that the reading frames of the sequences are in phase. This permits translation into a single fusion protein that retains the biological activity of both component polypeptides. A peptide linker sequence may be employed to separate the first and the second polypeptide components by a distance sufficient to ensure that each polypeptide folds into its secondary and tertiary structures Such a peptide linker sequence is incorporated into the fusion protein using standard techniques well known in the art. Suitable peptide linker sequences may be chosen based on the following factors: (1) their abihty to adopt a flexible extended conformation; (2) their inability to adopt a secondary structure that could interact with functional epitopes on the first and second polypeptides; and (3) the lack of hydrophobic or charged residues that might react with the polypeptide functional epitopes. Preferred peptide linker sequences contain Gly, Asn and Ser residues. Other near neutral amino acids, such as Thr and Ala may also be used in the linker sequence. Amino acid sequences which may be usefully employed as linkers include those disclosed in Maratea et al., 1985, Gene 40:39-46; Murphy et al., 1986, Proc. Natl. Acad. Sci. USA 83:8258-8262; U.S. Patent No. 4,935,233 and U.S. Patent No. 4,751,180. The linker sequence may generally be from 1 to about 50 amino acids in length. Linker sequences are not required when the first and second polypeptides have non-essential N-terminal amino acid regions that can be used to separate the functional domains and prevent stenc interference The hgated DNA sequences are operably linked to suitable transcnptional or translational regulatory elements. The regulatory elements responsible for expression of DNA are located 5' to the DNA sequence encoding the first polypeptides. Similarly, stop codons required to end translation and transcnption termination signals are present 3' to the DNA sequence encoding the second polypeptide. Fusion proteins are also provided that comprise a polypeptide of the present invention together with an unrelated lmmunogenic protein. Preferably the immunogemc protein is capable of eliciting a recall response. Examples of such proteins include tetanus, tuberculosis and hepatitis proteins (see, for example, Stoute et al., 1997, New Engl. J. Med., 336:86-9). Within preferred embodiments, an lmmunological fusion partner is denved from protein D, a surface protein of the gram-negative bactenum Haemophtlus influenza B (WO 91/18926). Preferably, a protein D denvative compnses approximately the first third of the protein (e.g., the first N-terminal 100-110 amino acids), and a protein D denvative may be hpidated. Within certain preferred embodiments, the first 109 residues of a Lipoprotein D fusion partner is included on the N-terminus to provide the polypeptide with additional exogenous T-cell epitopes and to increase the expression level in E. coll (thus functioning as an expression enhancer). The hpid tail ensures optimal presentation of the antigen to antigen presenting cells. Other fusion partners mclude the non- structural protein from influenza virus, NS1 (hemagluunin). Typically, the N-terminal 81 amino acids are used, although different fragments that include T-helper epitopes may be used. In another embodiment, the lmmunological fusion partner is the protem known as LYTA, or a portion thereof (preferably a C-terminal portion). LYTA is denved from Streptococcus pneumoniae, which synthesizes an N-acetyl-L-alanine amidase known as amidase LYTA (encoded by the LytA gene; Gene 43:265-292, 1986). LYTA is an autolysin that specifically degrades certain bonds in the peptidoglycan backbone. The C- terminal domain of the LYTA protein is responsible for the affinity to the chohne or to some chohne analogues such as DEAE. This property has been exploited for the development of E. coh C-LYTA expressing plasmids useful for expression of fusion proteins. Punfication of hybnd proteins containing the C-LYTA fragment at the amino terminus has been described (see Biotechnology 10:795-798, 1992). Within a preferred embodiment, a repeat portion of LYTA may be incorporated into a fusion protein. A repeat portion is found in the C-terminal region starting at residue 178. A particularly preferred repeat portion incorporates residues 188-305. In some embodiments, it may be desirable to couple a therapeutic agent and a polypeptide of the invention, or to couple more than one polypeptide of the invention. For example, more than one agent or polypeptide may be coupled direcdy to a first polypeptide of the invention, or linkers that provide multiple sites for attachment can be used. Alternatively, a earner can be used. Some molecules are particularly suitable for intercellular trafficking and protem delivery, including, but not limited to, VP22 (EUtott and O'Hare, 1997, Cell 88:223-233; see also Kim et al., 1997, J. Immunol. 159:1666-1668; Rojas et al, 1998, Nature Biotechnology 16:370; Kato et al., 1998, FEBS Lett. 427(2):203-208; Vives et al., 1997, J. Biol. Chem. 272(25):16010-7; Nagahara et al., 1998, Nature Med. 4(12):1449-1452). A carrier may bear the agents or polypeptides m a vanety of ways, including covalent bonding either directly or via a linker group. Suitable carriers include proteins such as albumins (e.g., U.S. Patent No. 4,507,234, to Kato et al.), peptides and polysacchandes such as aminodextran (e.g., U.S. Patent No. 4,699,784, to Shih et al). A earner may also bear an agent by noncovalent bonding or by encapsulation, such as within a hposome vesicle (e.g., U.S. Patent Nos. 4,429,008 and 4,873,088). In general, polypeptides (including fusion protems) and polynucleotides as descnbed herein are isolated. An "isolated" polypeptide or polynucleotide is one that is removed from its onginal environment. For example, a naturally occurring protem is isolated if it is separated from some or all of the coexisting matenals in the natural system. Preferably, such polypeptides are at least about 90% pure, more preferably at least about 95% pure and most preferably at least about 99% pure. A polynucleotide is considered to be isolated if, for example, it is cloned mto a vector that is not part of the natural environment. The polypeptide can be isolated from its naturally occurring form, produced by recombinant means or synthesized chemically. Recombinant polypeptides encoded by DNA sequences described herem can be readily prepared from the DNA sequences usmg any of a vanety of expression vectors known to those of ordinary skill in the art. Expression may be achieved in any appropnate host cell that has been transformed or transfected with an expression vector containing a DNA molecule that encodes a recombinant polypeptide. Suitable host cells mclude prokaryotes, yeast and higher eukaryotic cells. Preferably the host cells employed are E. colt, yeast or a mammalian cell line such as Cos or CHO. Supernatants from the soluble host/vector systems that secrete recombinant protein or polypeptide into culture media may be first concentrated usmg a commercially available filter. Following concentration, the concentrate may be applied to a suitable punfication matrix such as an affinity matrix or an ion exchange resm. Finally, one or more reverse phase HPLC steps can be employed to further punfy a recombinant polypeptide. Fragments and other vanants having less than about 100 ammo acids, and generally less than about 50 amino acids, may also be generated by synthetic means, usmg techniques well known to those of ordinary skill m the art. For example, such polypeptides may be synthesized usmg any of the commercially available sohd-phase techniques, such as the Mernfield sohd-phase synthesis method, wherem ammo acids are sequentially added to a growing ammo acid chain (Mernfield, 1963, J. Am. Chem. Soc. 85:2146-2149). Equipment for automated synthesis of polypeptides is commercially available from suppliers such as Perkin Elmer/Applied BioSystems Division (Foster City, CA), and may be operated according to the manufacturer's instructions. Vanants of the polypeptide for use in accordance with the invention can have one or more amino acid substitutions, deletions, additions and/or insertions in the amino acid sequence indicated that result m a polypeptide that retains the abihty to elicit an immune response to HSV or HSV-mfected cells. Such variants may generally be identified by modifying one of the polypeptide sequences described herem and evaluating the reactivity of the modified polypeptide usmg a known assay such as a T cell assay descnbed herem. Polypeptide variants preferably exhibit at least about 70%, more preferably at least about 90%, and most preferably at least about 95% identity to the identified polypeptides. These ammo acid substitutions mclude, but are not necessarily limited to, ammo acid substitutions known m the art as "conservative". A "conservative" substitution is one in which an amino acid is substituted for another ammo acid that has similar properties, such that one skilled m the art of peptide chemistry would expect the secondary structure and hydropathic nature of the polypeptide to be substantially unchanged. Amino acid substitutions may generally be made on the basis of similarity m polanty, charge, solubility, hydrophobicity, hydrophihcity and/or the amphipathic nature of the residues. For example, negatively charged ammo acids include aspartic acid and glutamic acid; positively charged ammo acids mclude lysme and arginine; and ammo acids with uncharged polar head groups having similar hydrophihcity values include leucine, isoleucine and vahne; glycine and alanine; asparagine and glutamine; and senne, threonine, phenylalanine and tyrosine. Other groups of ammo acids that may represent conservative changes mclude: (1) ala, pro, gly, glu, asp, gin, asn, ser, thr; (2) cys, ser, tyr, thr; (3) val, lie, leu, met, ala, phe; (4) lys, arg, his; and (5) phe, tyr, tip, his. A variant may also, or alternatively, contain nonconservative changes. In a preferred embodiment, vanant polypeptides differ from a native sequence by substitution, deletion or addition of five ammo acids or fewer. Variants may also (or alternatively) be modified by, for example, the deletion or addition of amino acids that have minimal influence on the lmmunogenicity, secondary structure and hydropathic nature of the polypeptide Polynucleotides. Vectors. Host Cells and Recombmant Viruses The invention provides polynucleotides that encode one or more polypeptides of the invention. The polynucleotide can be mcluded in a vector. The vector can further compnse an expression control sequence operably linked to the polynucleotide of the invention. In some embodiments, the vector includes one or more polynucleotides encoding other molecules of interest. In one embodiment, the polynucleotide of the invention and an additional polynucleotide can be linked so as to encode a fusion protem. Within certam embodiments, polynucleotides may be formulated so to permit entry mto a cell of a mammal, and expression therein Such formulations are particularly useful for therapeutic purposes, as descnbed below. Those of ordinary skill m the art will appreciate that there are many ways to achieve expression of a polynucleotide in a target cell, and any suitable method may be employed. For example, a polynucleotide may be incorporated mto a viral vector such as, but not limited to, adenovirus, adeno-associated virus, retrovirus, or vaccinia or other pox virus (e.g., avian pox virus). Techniques for incorporating DNA mto such vectors are well known to those of ordinary skill m the art A retroviral vector may additionally transfer or incorporate a gene for a selectable marker (to aid m the identification or selection of transduced cells) and/or a targeting moiety, such as a gene that encodes a hgand for a receptor on a specific target cell, to render the vector target specific. Targeting may also be accomplished usmg an antibody, by methods known to those of ordinary skill in the art The invention also provides a host cell transformed with a vector of the invention. The transformed host cell can be used m a method of producing a polypeptide of the invention. The method compnses cultunng the host cell and recovering the polypeptide so produced. The recovered polypeptide can be punfied from culture supernatant. Vectors of the invention can be used to genetically modify a cell, either in vivo, ex vivo or in vitro. Several ways of genetically modifying cells are known, including transduction or infection with a viral vector either direcdy or via a retroviral producer cell, calcium phosphate precipitation, fusion of the recipient cells with bacterial protoplasts containing the DNA, treatment of the recipient cells with hposomes or microspheres containing the DNA, DEAE dextran, receptor-mediated endocytosis, electroporation, micro-injection, and many other techniques known to those of skill. See, e.g., Sambrook et al. Molecular Cloning - A Laboratory Manual (2nd ed.) 1-3, 1989; and Current Protocols m Molecular Biology, F.M. Ausubel et al., eds., Greene Publishing Associates, Inc. and John Wiley & Sons, Inc., (1994 Supplement). Examples of viral vectors mclude, but are not limited to retroviral vectors based on, e.g., HIV, SrV, and murme retroviruses, gibbon ape leukemia virus and other viruses such as adeno-associated viruses (AAVs) and adenoviruses. (Miller et al. 1990, Mol. Cell Biol 10:4239; J. Kolberg 1992, NIH Res. 4:43, and Cornetta et al. 1991, Hum. Gene Ther 2:215). Widely used retroviral vectors mclude those based upon murme leukemia virus (MuLV), gibbon ape leukemia virus (GaLV), ecotropic retroviruses, simian immunodeficiency virus (SIV), human immunodeficiency virus (HIV), and combinations. See, e.g. Buchscher et al. 1992, J. Virol 66(5):2731-2739; Johann et al. 1992, J. Virol 66(5):1635-1640; Sommerfelt et al. 1990, Virol 176:58-59; Wilson et al. 1989, J. Virol 63:2374-2378; Miller et al. 1991, J. Viro 65:2220-2224, and Rosenberg and Fauci 1993 in Fundamental Immunology, Third Edition, W.E. Paul (ed.) Raven Press, Ltd., New York and the references therein; Miller et al. 1990, Mol. Cell. Biol 10:4239; R. Kolberg 1992, J. NIH Res. 4:43; and Cornetta et al. 1991, Hum. Gene Ther. 2:215. In vitro amplification techmques suitable for amplifying sequences to be subcloned mto an expression vector are known. Examples of such in vitro amplification methods, including the polymerase chain reaction (PCR), hgase cham reaction (LCR), Qβ-rephcase amplification and other RNA polymerase mediated techmques (e.g., NASBA), are found m Sambrook et al. 1989, Molecular Cloning - A Laboratory Manual (2nd Ed) Y ; and U.S. Patent No. 4,683,202; PCR Protocols A Guide to Methods and Applications (Innis et al. eds.) Academic Press Inc. San Diego, CA 1990. Improved methods of cloning in vitro amplified nucleic acids are descnbed m U.S. Patent No. 5,426,039. The invention additionaUy provides a recombinant microorganism geneticaUy modified to express a polynucleotide of the invention. The recombinant microorganism can be useful as a vaccme, and can be prepared usmg techmques known in the art for the preparation of live attenuated vaccmes Examples of microorganisms for use as live vaccmes mclude, but are not limited to, viruses and bactena. In a preferred embodiment, the recombinant microorganism is a virus. Examples of suitable viruses mclude, but are not limited to, vaccinia virus, canary pox virus, retrovirus, lentivirus, HSV and adenovirus Compositions The invention provides compositions that are useful for treating and preventing HSV infection. The compositions can be used to inhibit viral replication and to kiU viraUy- mfected ceUs. In one embodiment, the composition is a pharmaceutical composition. The composition can comprise a therapeuticaUy or prophylacticaUy effective amount of a polypeptide, polynucleotide, recombinant virus, APC or immune ceU of the invention. An effective amount is an amount sufficient to ehcit or augment an immune response, e.g., by activating T ceUs. One measure of the activation of T ceUs is a cytotoxicity assay, as descnbed m D.M. KoeUe et al, 1997, Human Immunol. 53:195-205. In some embodiments, the composition is a vaccme. The composition can optionaUy mclude a earner, such as a pharmaceuticaUy acceptable earner. PharmaceuticaUy acceptable earners are determined m part by the particular composition being administered, as weU as by the particular method used to administer the composition Accordingly, there is a wide vanety of suitable formulations of pharmaceutical compositions of the present invention. Formulations suitable for parenteral administration, such as, for example, by lntraarticular (m the jomts), intravenous, intramuscular, lntradermal, mtrapentoneal, and subcutaneous routes, and carriers mclude aqueous lsotonic sterile injection solutions, which can contain antioxidants, buffers, bactenostats, and solutes that render the formulation isotomc with the blood of the intended recipient, and aqueous and non-aqueous sterile suspensions that can mclude suspending agents, solubi zers, thickening agents, stabilizers, preservatives, hposomes, microspheres and emulsions. The composition of the invention can further compnse one or more adjuvants. Examples of adjuvants mclude, but are not limited to, helper peptide, alum, Freund's, muramyl tnpeptide phosphatidyl ethanolamine or an lmmunostimulating complex, mcludmg cytokines. In some embodiments, such as with the use of a polynucleotide vaccme, an adjuvant such as a helper peptide or cytokine can be provided via a polynucleotide encoding the ad j uvant. Vaccme preparation is generaUy descnbed m, for example, M.F. PoweU and M.J. Newman, eds., "Vaccme Design (the subunit and ad j uvant approach)," Plenum Press (NY, 1995). Pharmaceutical compositions and vaccmes within the scope of the present invention may also contain other compounds, which may be biologicaUy active or inactive. For example, one or more immunogemc portions of other viral antigens may be present, either incorporated mto a fusion polypeptide or as a separate compound, within the composition or vaccme. A pharmaceutical composition or vaccme may contain DNA encoding one or more of the polypeptides of the invention, such that the polypeptide is generated in situ. As noted above, the DNA may be present within any of a variety of dehvery systems known to those of ordinary skiU m the art, mcludmg nucleic acid expression systems, bactena and viral expression systems. Numerous gene dehvery techmques are weU known in the art, such as those descnbed by RoUand, 1998, Cnt. Rev. Therap. Drug Carrier Systems 15:143-198, and references cited therein. Appropnate nucleic acid expression systems contain the necessary DNA sequences for expression in the patient (such as a suitable promoter and terminating signal). Bactenal dehvery systems involve the administration of a bactenum (such as Ba ll s-Calmette-Guernn) that expresses an immunogemc portion of the polypeptide on its ceU surface or secretes such an epitope. In a preferred embodiment, the DNA may be introduced usmg a viral expression system (e.g., vaccinia or other pox virus, retrovirus, or adenovirus), which may involve the use of a non- pathogenic (defective), replication competent virus. Suitable systems are disclosed, for example, m Fisher-Hoch et al, 1989, Proc. Natl. Acad. Sci. USA 86:317-321; Flexner et al, 1989, Ann. My Acad. Sci. 569:86-103; Flexner et al, 1990, Vaccme 8:17-21; U.S. Patent Nos.4,603,112, 4,769,330, and 5,017,487; WO 89/01973; U.S. Patent No. 4,777,127; GB 2,200,651; EP 0,345,242; WO 91102805; Berkner, 1988, Biotechniques 6:616-627; Rosenfeld et al, 1991, Science 252:431-434; KoUs et al, 1994, Proc. Nad. Acad. Sci. USA 91 :215-219; Kass-Eisler et al, 1993, Proc. Nad. Acad. Sci. USA 90:11498-11502; Guzman et al, 1993, Circulation 88:2838-2848; and Guzman et al, 1993, Or. Res. 73:1202-1207. Techmques for incorporating DNA mto such expression systems are weU known to those of ordinary skiU m the art. The DNA may also be "naked," as descnbed, for example, m Ulmer et al, 1993, Science 259:1745-1749 and reviewed by Cohen, 1993, Science 259:1691-1692. The uptake of naked DNA may be mcreased by coating the DNA onto biodegradable beads, which are efficiendy transported mto the ceUs. While any suitable earner known to those of ordinary skiU m the art may be employed m the pharmaceutical compositions of this invention, the type of earner wiU vary dependmg on the mode of admmistration. Compositions of the present invention may be formulated for any appropriate manner of administration, mcludmg for example, topical, oral, nasal, intravenous, lntracranial, mtrapentoneal, subcutaneous or intramuscular adrninistration. For parenteral administration, such as subcutaneous injection, the earner preferably compnses water, saline, alcohol, a fat, a wax or a buffer. For oral administration, any of the above earners or a sohd earner, such as manmtol, lactose, starch, magnesium stearate, sodium saccharine, talcum, ceUulose, glucose, sucrose, and magnesium carbonate, may be employed. Biodegradable microspheres (e.g., polylactate polyglycolate) may also be employed as earners for the pharmaceutical compositions of this invention. Suitable biodegradable microspheres are disclosed, for example, in U.S. Patent Nos. 4,897,268 and 5,075,109. Such compositions may also compnse buffers (e.g., neutral buffered saline or phosphate buffered saline), carbohydrates (e.g., glucose, mannose, sucrose or dextrans), manmtol, protems, polypeptides or ammo acids such as glycme, antioxidants, chelating agents such as EDTA or glutathione, adjuvants (e.g., aluminum hydroxide) and/or preservatives. Alternatively, compositions of the present invention may be formulated as a lyophihzate. Compounds may also be encapsulated within hposomes using weU known technology. Any of a vanety of adjuvants may be employed m the vaccmes of this invention. Most adjuvants contain a substance designed to protect the antigen from rapid catabohsm, such as aluminum hydroxide or mmeral oil, and a stimulator of immune responses, such as hpid A, Bortadella pertussis or Mycobactenum tuberculosis derived protems. Suitable adjuvants are commerciaUy available as, for example, Freund's Incomplete Adjuvant and Complete Adjuvant (Difco Laboratones, Detroit, MI); Merck Adjuvant 65 (Merck and Company, Inc., Rahway, NJ); aluminum salts such as aluminum hydroxide gel (alum) or aluminum phosphate; salts of calcium, iron or z c; an insoluble suspension of acylated tyrosine acylated sugars; cationicaUy or aniomcaUy denvatized polysacchandes; polyphosphazenes biodegradable microspheres; monophosphoryl hpid A and quil A. Cytokines, such as GM CSF or ιnterleukιn-2, -7, or -12, may also be used as adjuvants Within the vaccmes provided herein, the adjuvant composition is preferably designed to duce an immune response predominandy of the Thl type. High levels of Thl-type cytokines (e.g., IFN-γ, IL-2 and IL-12) tend to favor the induction of ceU mediated immune responses to an administered antigen. In contrast, high levels of Th2-type cytokines (e.g., IL-4, IL-5, IL-6, IL-10 and TNF-β) tend to favor the induction of humoral immune responses. FoUowing application of a vaccme as provided herem, a patient wiU support an immune response that includes Thl- and Th2-type responses. Within a preferred embodiment, in which a response is predominandy Thl-type, the level of Thl-type cytokines wiU increase to a greater extent than the level of Th2-type cytokines. The levels of these cytokines may be readily assessed usmg standard assays. For a review of the famihes of cytokines, see Mosmann and Coffman, 1989, Ann. Rev. Immunol. 7:145-173. Preferred adjuvants for use m eliciting a predominandy Thl-type response mclude, for example, a combination of monophosphoryl hpid A, preferably 3-de-O-acylated monophosphoryl hpid A (3D-MPL), together with an aluminum salt. MPL™ adjuvants are available from Conxa Corporation (see US Patent Nos. 4,436,727; 4,877,611; 4,866,034 and 4,912,094). CpG-containing ohgonucleotides (in which the CpG dinucleotide is unmethylated) also induce a predommandy Thl response. Such ohgonucleotides are weU known and are descnbed, for example, in WO 96/02555. Another preferred adjuvant is a saponin, preferably QS21, which may be used alone or in combination with other adjuvants For example, an enhanced system involves the combination of a monophosphoryl hpid A and saponin denvative, such as the combination of QS21 and 3D-MPL as descnbed m WO 94/00153, or a less reactogenic composition where the QS21 is quenched with cholesterol, as described m WO 96/33739. Other preferred formulations compnses an oil-in-water emulsion and tocopherol A particularly potent adjuvant formulation involving QS21 , 3D-MPL and tocopherol in an oil-in- water emulsion is descnbed m WO 95/17210. Another adjuvant that may be used is AS-2 (Smith-Khne Beecham). Any vaccme provided herein may be prepared using weU known methods that result m a combination of antigen, immune response enhancer and a suitable carrier or excipient. The compositions described herem may be administered as part of a sustamed release formulation (ι.e., a formulation such as a capsule or sponge that effects a slow release of compound foUowmg administration). Such formulations may generaUy be prepared usmg weU known technology and administered by, for example, oral, rectal or subcutaneous implantation, or by implantation at the desired target site. Sustained-release formulations may contam a polypeptide, polynucleotide or antibody dispersed in a earner matrix and/or contamed within a reservoir surrounded by a rate controlling membrane. Carners for use within such formulations are biocompatible, and may also be biodegradable; preferably the formulation provides a relatively constant level of active component release. The amount of active compound contained within a sustamed release formulation depends upon the site of implantation, the rate and expected duration of release and the nature of the condition to be treated or prevented. Any of a vanety of dehvery vehicles may be employed within pharmaceutical compositions and vaccmes to facilitate production of an antigen-specific immune response that targets HSV-mfected ceUs. Dehvery vehicles mclude antigen presenting ceUs (APCs), such as dendntic ceUs, macrophages, B ceUs, monocytes and other ceUs that may be engineered to be efficient APCs. Such ceUs may, but need not, be geneticaUy modified to increase the capacity for presenting the antigen, to improve activation and/or maintenance of the T ceU response, to have antiviral effects per se and/or to be immunologicaUy compatible with the receiver (i.e., matched HLA haplotype). APCs may generaUy be isolated from any of a variety of biological fluids and organs, mcludmg tumor and pentumoral tissues, and may be autologous, aUogeneic, syngeneic or xenogeneic ceUs. Certain preferred embodiments of the present invention use dendntic ceUs or progenitors thereof as antigen-presenting ceUs. Dendntic ceUs are highly potent APCs (Banchereau and Steinman, Nature 392:245-251, 1998) and have been shown to be effective as a physiological adjuvant for eliciting prophylactic or therapeutic immunity (see Timmerman and Levy, Ann. Rev. Med. 50:507-529, 1999). In general, dendntic ceUs may be identified based on their typical shape (steUate in situ, with marked cytoplasmic processes (dendntes) visible in vitro) and based on the lack of differentiation markers of B ceUs (CD19 and CD20), T ceUs (CD3), monocytes (CD14) and natural kiUer ceUs (CD56), as determined usmg standard assays. Dendntic ceUs may, of course, be engineered to express specific ceU-surface receptors or hgands that are not commonly found on dendntic ceUs in vivo or ex vivo, and such modified dendntic ceUs are contemplated by the present invention. As an alternative to dendntic ceUs, secreted vesicles antigen-loaded dendntic ceUs (caUed exosomes) may be used within a vaccme (Zitvogel et al, 1998, Nature Med. 4:594-600). Dendntic ceUs and progemtors may be obtamed from penpheral blood, bone marrow, tumor-mfiltrating ceUs, pentumoral tissues- filtrating ceUs, lymph nodes, spleen, skin, umbilical cord blood or any other suitable tissue or fluid. For example, dendntic ceUs may be differentiated ex vivo by adding a combination of cytokines such as GM-CSF, IL-4, IL-13 and/or TNFα to cultures of monocytes harvested from penpheral blood. Alternatively, CD34 positive ceUs harvested from penpheral blood, umbilical cord blood or bone marrow may be differentiated mto dendntic ceUs by adding to the culture medium combinations of GM-CSF, IL-3, TNFα, CD40 hgand, LPS, flt3 hgand and/or other comρound(s) that induce maturation and proliferation of dendntic ceUs. Dendntic ceUs are conveniendy categonzed as "immature" and "mature" ceUs, which aUows a simple way to (discriminate between two weU characterized phenotypes. However, this nomenclature should not be construed to exclude aU possible intermediate stages of differentiation. Immature dendntic ceUs are characterized as APC with a high capacity for antigen uptake and processing, which correlates with the high expression of Fcγ receptor, mannose receptor and DEC-205 marker. The mature phenotype is typicaUy characterized by a lower expression of these markers, but a high expression of ceU surface molecules responsible for T ceU activation such as class I and class II MHC, adhesion molecules (e.g., CD54 and CD11) and costtmulatory molecules (e.g., CD40, CD80 and CD86). APCs may generaUy be transfected with a polynucleotide encodmg a polypeptide (or portion or other variant thereof) such that the polypeptide, or an immunogemc portion thereof, is expressed on the ceU surface. Such transfection may take place ex vivo, and a composition or vaccme compnsmg such transfected ceUs may then be used for therapeutic purposes, as descnbed herem. Alternatively, a gene dehvery vehicle that targets a dendntic or other antigen presenting ceU may be adrninistered to a patient, resulting m transfection that occurs in vivo. In vivo and ex vivo transfection of dendntic ceUs, for example, may generaUy be performed using any methods known m the art, such as those described in WO 97/24447, or the gene gun approach descnbed by Mahvi et al, 1997, Immunology and CeU Biology 75:456-460. Antigen loading of dendntic ceUs may be achieved by mcubatmg dendntic ceUs or progemtor ceUs with the tumor polypeptide, DNA (naked or within a plasmid vector) or RNA; or with antigen- expressing recombmant bactenum or viruses (e.g., vaccinia, fowlpox, adenovirus or lentivirus vectors). Pnor to loading, the polypeptide may be covalendy con j ugated to an lmmunological partner that provides T ceU help (e.g., a carrier molecule). Alternatively, a dendntic ceU may be pulsed with a non-con j ugated lmmunological partner, separately or m the presence of the polypeptide. Administration of the Compositions Treatment mcludes prophylaxis and therapy. Prophylaxis or treatment can be accomplished by a single direct injection at a single time point or multiple time points. Administration can also be nearly simultaneous to multiple sites. Patients or subjects mclude mammals, such as human, bovine, equine, canine, feline, porcine, and ovine animals. Preferably, the patients or subjects are human. Compositions are typicaUy administered in vivo via parenteral (e.g. intravenous, subcutaneous, and intramuscular) or other traditional direct routes, such as buccal/subhngual, rectal, oral, nasal, topical, (such as transdermal and ophthalmic), vaginal, pulmonary, lntraarteπal, lntraperitoneal, intraocular, or intranasal routes or direcdy mto a specific tissue The compositions are adrriinistered in any suitable manner, often with pharmaceuticaUy acceptable carriers Suitable methods of administering ceUs m the context of the present mvention to a patient are available, and, although more than one route can be used to administer a particular ceU composition, a particular route can often provide a more immediate and more effective reaction than another route. The dose administered to a patient, m the context of the present mvention should be sufficient to effect a beneficial therapeutic response m the patient over time, or to inhibit mfection or disease due to mfection. Thus, the composition is admimstered to a patient m an amount sufficient to ehcit an effective immune response to the specific antigens and/or to aUeviate, reduce, cure or at least partiaUy arrest symptoms and/or complications from the disease or mfection. An amount adequate to accomplish this is defined as a "therapeuticaUy effective dose." The dose wiU be determined by the activity of the composition produced and the condition of the patient, as weU as the body weight or surface areas of the patient to be treated. The size of the dose also wiU be determined by the existence, nature, and extent of any adverse side effects that accompany the adrninistration of a particular composition m a particular patient. In determining the effective amount of the composition to be administered m the treatment or prophylaxis of diseases such as HSV mfection, the physician needs to evaluate the production of an immune response against the virus, progression of the disease, and any treatment-related toxicity. For example, a vaccme or other composition containing a subumt HSV protem can mclude 1-10,000 mtcrograms of HSV protem per dose. In a preferred embodiment, 10- 1000 micrograms of HSV protem is mcluded m each dose m a more preferred embodiment 10-100 micrograms of HSV protem dose. Preferably, a dosage is selected such that a single dose wiU suffice or, alternatively, several doses are administered over the course of several months. For compositions containing HSV polynucleotides or peptides, similar quantities are administered per dose. In one embodiment, between 1 and 10 doses may be administered over a 52 week period Preferably, 6 doses are administered, at intervals of 1 month, and booster vaccmations may be given penodicaUy thereafter Alternate protocols may be appropnate for individual patients. A suitable dose is an amount of a compound that, when administered as described above, is capable of promoting an antiviral immune response, and is at least 10-50% above the basal (i.e., untreated) level. Such vaccines should also be capable of causmg an immune response that leads to an improved clinical outcome m vaccmated patients as compared to non-vaccinated patients. In general, for pharmaceutical compositions and vaccines comprising one or more polypeptides, the amount of each polypeptide present m a dose ranges from about 0.1 μg to about 5 mg per kg of host. Preferably, the amount ranges from about 10 to about 1000 μg per dose. Suitable volumes for administration wύl vary with the size, age and immune status of the patient, but wiU typicaUy range from about 0.1 mL to about 5 mL, with volumes less than about 1 mL bemg most common. Compositions compnsing immune ceUs are preferably prepared from immune ceUs obtamed from the subject to whom the composition wiU be administered. Alternatively, the immune ceUs can be prepared from an HLA-compatible donor. The immune ceUs are obtained from the subject or donor usmg conventional techmques known in the art, exposed to APCs modified to present an epitope of the mvention, expanded ex vivo, and administered to the subject. Protocols for ex vivo therapy are descnbed m Rosenberg et al, 1990, New England J. Med. 9:570-578. In addition, compositions can compnse APCs modified to present an epitope of the mvention. Immune ceUs may generaUy be obtained m sufficient quantities for adoptive lmmunotherapy by growth in vitro, as described herem Culture conditions for expanding single antigen-specific effector ceUs to several biUion in number with retention of antigen recognition in vivo are weU known m the art Such in vitro culture conditions typicaUy use intermittent stimulation with antigen, often m the presence of cytokines (such as IL-2) and non-dividing feeder ceUs. As noted above, irnmunoreactive polypeptides as provided herem may be used to enrich and rapidly expand antigen-specific T ceU cultures m order to generate a sufficient number of ceUs for lmmunotherapy. In particular, antigen- presenting ceUs, such as dendntic, macrophage, monocyte, fibroblast and/or B ceUs, may be pulsed with irnmunoreactive polypeptides or transfected with one or more polynucleotides usmg standard techmques weU known in the art. For example, antigen- presenting ceUs can be transfected with a polynucleotide having a promoter appropnate for increasing expression m a recombinant virus or other expression system. Cultured effector ceUs for use m therapy must be able to grow and distribute widely, and to survive long term in vivo. Studies have shown that cultured effector ceUs can be induced to grow in vivo and to survive long term in substantial numbers by repeated stimulation with antigen supplemented with IL-2 (see, for example, Cheever et al, 1997, lmmunological Reviews 157:177). Administration by many of the routes of administration described herem or otherwise known m the art may be accomphshed simply by direct administration usmg a needle, catheter or related device, at a single time point or at multiple time points. In Vivo Testing of Identified Antigens Conventional techmques can be used to confirm the in vivo efficacy of the identified HSV antigens. For example, one techmque makes use of a mouse chaUenge model. Those skilled m the art, however, wiU appreciate that these methods are routine, and that other models can be used. Once a compound or composition to be tested has been prepared, the mouse or other subject is immunized with a senes of injections. For example up to 10 injections can be admimstered over the course of several months, typicaUy with one to 4 weeks elapsmg between doses. FoUowmg the last injection of the senes, the subject is chaUenged with a dose of virus established to be a uniformly lethal dose. A control group receives placebo, while the experimental group is actively vaccmated. Alternatively, a study can be designed usmg sublethal doses. OptionaUy, a dose-response study can be mcluded. The end points to be measured m this study mclude death and severe neurological impairment, as evidenced, for example, by spmal cord gait. Survivors can also be sacnficed for quantitative viral cultures of key organs mcludmg sp al cord, brain, and the site of in j ection. The quantity of virus present in ground up tissue samples can be measured. Compositions can also be tested in previously infected animals for reduction m recurrence to confirm efficacy as a therapeutic vaccme Efficacy can be determined by calculating the IC50, which indicates the micrograms of vaccme per kilogram body weight required for protection of 50% of sub j ects from death. The IC50 wiU depend on the chaUenge dose employed. In addition, one can calculate the LD50, indicating how many infectious units are required to kiU one half of the subjects receivmg a particular dose of vaccme. Determination of the post mortem viral titer provides confirmation that viral replication was limited by the immune system. A subsequent stage of testing would be a vaginal inoculation chaUenge. For acute protection studies, mice can be used. Because they can be studied for both acute protection and prevention of recurrence, guinea pigs provide a more physiologicaUy relevant subject for extrapolation to humans. In this type of chaUenge, a non-lethal dose is administered, the gumea pig subjects develop lesions that heal and recur. Measures can mclude both acute disease amelioration and recurrence of lesions. The intervention with vaccme or other composition can be provided before or after the inoculation, dependmg on whether one wishes to study prevention versus therapy. Methods The mvention provides a method for treatment and/or prevention of HSV mfection m a subject. The method compnses administering to the subject a composition of the mvention. The composition can be used as a therapeutic or prophylactic vaccme. In one embodiment, the HSV is HSV-2. Alternatively, the HSV is HSV- 1. The mvention additionaUy provides a method for inhibiting HSV replication, for killing HSV-mfected ceUs, for increasing secretion of lymphokines having antiviral and/or lrnmunomodulatory activity, and for enhancmg production of herpes-specific antibodies. The method compnses contacting an HSV-mfected ceU with an immune ceU directed against an antigen of the mvention, for example, as descnbed m the Examples presented herem. The contacting can be performed in vitro or in vivo. In a preferred embodiment, the immune ceU is a T ceU. T ceUs mclude CD4 and CD8 T ceUs. Compositions of the invention can also be used as a tolenzing agent against lmmunopathologic disease. In addition, the mvention provides a method of producmg immune ceUs directed agamst HSV. The method compnses contacting an immune ceU with an antigen-presenting ceU, wherem the antigen-presenting ceU is modified to present an antigen included in a polypeptide of the mvention. Preferably, the antigen-presenting ceU is a dendntic ceU The ceU can be modified by, for example, peptide loading or genetic modification with a nucleic acid sequence encodmg the polypeptide. In one embodiment, the immune ceU is a T ceU. T ceUs mclude CD4 and CD8 T ceUs. Also provided are immune ceUs produced by the method. The immune ceUs can be used to inhibit HSV replication, to kiU HSV- mfected ceUs, in vitro or in vivo, to mcrease secretion of lymphokines having antiviral and/or lrnmunomodulatory activity, to enhance production of herpes-specific antibodies, or m the treatment or prevention of HSV mfection in a subject. The invention provides methods for identifymg immunogemc epitopes associated with infectious organisms. In one embodiment, the method comprises preparing a coUection of random fragments of the orgamsmal genome. The preparing can compnse digesting the entire genome, although it is not necessary to begin with the fuU genome. The digesting preferably comprises contacting the genome with one or more restnction enzymes to obtam a coUection of random fragments havmg a desired range of lengths. Alternatively, one can sonicate, nebulize or otherwise treat matenal containing the genome of interest and isolate from a gel fragments of an appropriate size. The digesting, and the selection of restnction enzymes, is designed to obtain fragments of the genome that are longer than the average length of a T ceU epitope, e.g., greater than about 30 nucleotides m length Preferably, the fragments are smaU enough such that genetic stops are infrequent, e.g., about 200 to about 500 base pairs m length. Where the genomic sequence or a restriction map of an organism of mterest is known, one can analyze the genome to identify restnction sites that, if targeted with the appropriate restnction enzymes, wiU result m the desired number of fragments of an appropriate length. The restriction enzymes can also be selected to target sites that are compatible with sites in a cloning vector to be used. The random fragments can then be used to express polypeptides encoded by the fragments. The fragments can be expressed mdividuaUy, or preferably, as a pool of polypeptides, either alone or as fusion pro terns. Those skilled m the art wiU appreciate that polypeptides can be expressed from either DNA or RNA as a starting matenal. For example, expression of polypeptides from RNA viruses can be achieved by first preparing a cDNA from the RNA fragment, and then using the cDNA to express the polypeptide. The polypeptide can be expressed from a vector containing the fragment of genome. In a preferred embodiment, the vector is a plasmid, such as a pcDNA3.1 (+)hιs vector. Those skiUed m the art wiU appreciate that other vectors can be used that are capable of expressmg polypeptide from an insert. Preferably, the polypeptide is expressed as a fusion protem. In one embodiment, the expressmg comprises cultunng a host ceU transfected or transduced with a vector containing the fragment of genome. In a preferred embodiment of the method, fragments are hgated mto expression vectors m the three different reading frames, and m both directions, to make a library. The quality of the library can be improved by hgating the genomic fragments usmg a partial fiU-m reaction. For example, the sticky ends created by digestion of HSV-2 with Sau3A I can result in hgation of multiple viral fragments to one another and m a vanety of onentations. A partial fiU-m reaction can be used to modify the sticky ends such that the fragments of viral genome wiU not hgate to each other, and only one viral insert wiU be present m each vector. This results m a library that is simpler and less time- consuming to analyze. The method further comprises assaymg the abihty of the expressed polypeptide to ehcit an immune response. The abihty to elicit an immune response is indicative of the presence of an immunogemc epitope within the polypeptide. In one embodiment, the immune response is a ceUular immune response The assaymg can compnse performing an assay that measures T ceU stimulation or activation. Examples of T ceUs include CD4 and CD8 T ceUs. One example of a T ceU stimulation assay is a cytotoxicity assay, such as that descnbed m KoeUe, DM et al. Human Immunol. 1997, 53;195-205. In one example, the cytotoxicity assay comprises contacting a ceU that presents the antigenic viral peptide in the context of the appropriate HLA molecule with a T ceU, and detecting the abihty of the T ceU to kiU the antigen presenting ceU. CeU killing can be detected by measuring the release of radioactive 51 Cr from the antigen presenting ceU Release of 51 Cr mto the medium from the antigen presenting ceU is indicative of ceU killing. An exemplary cntenon for mcreased killing is a statisticaUy significant mcrease m counts per minute (cpm) based on counting of 51 Cr radiation m media coUected from antigen presenting ceUs admixed with T ceUs as compared to control media coUected from antigen presenting ceUs admixed with media. The assay can be performed on pools of polypeptides to identify pools containing active moieties. Further assays can then be performed on increasingly smaUer subsets of the ongmal pools to isolate polypeptides of mterest The material containing a fragment of mterest, e.g., a plasmid with its viral insert, can be punfied and the viral fragment sequenced. Based on the obtamed sequence information, synthetic peptides can be prepared for subsequent testing and confirmation of the identified antigens. Sequencing of fragments can also lead to the identification of novel genes. The foregomg method steps can be repeated, wherem subfragments of the genome fragments are prepared. Increasingly smaUer fragments can be expressed and tested to determine the rninirnal epitope. The method of the invention can be apphed to a vanety of infectious orgamsms, mcludmg bacteria, parasites and viruses. Preferred viruses are those containing mtronless DNA or mostiy coding sequence Examples of viruses mclude double-stranded DNA viruses, smgle-stranded DNA viruses, double-stranded RNA viruses and smgle-stranded RNA viruses. Examples of double-stranded DNA viruses mclude, but are not limited to, Epstein-Barr virus (EBV), cytomegalovirus (CMV), herpes simplex vιrus-1 (HSV-1), HSV-2, vanceUa-zoster virus (VZV), human herpes vιrus-6 (HHV-6), HHV-7, HHV-8, poxvirus and adenovirus. Examples of smgle-stranded DNA viruses mclude, but are not limited to, parvovirus. Examples of double-stranded RNA viruses mclude, but are not limited to, retroviruses and reoviruses. Examples of smgle-stranded RNA viruses include, but are not limited to, paramyxoviruses, myxoviruses, and flaviviruses. Because the method does not require knowledge of the organism's nucleic acid sequence, it provides a strategy for combating mfectious orgamsms that display a great deal of biological vanabihty (e.g., HIV and HCV). For viruses exhibiting high vanabihty, it is advantageous to use a source of viral nucleic acid matenal denved from a particular patient, a particular site (e.g., blood, skin, cervix) or representative viral strain circulating m a particular geographical region or patient population, which may differ from prototypical strains of known nucleic acid sequence. In a preferred embodiment, the organism is HSV-2 and the fragments of viral genome are prepared by digestion with Sau3A I. Examples of other restnction enzymes that can be used mclude, but are not limited to, Apa I, Sma I, and Alu I. The fragments of genomic DNA are then hgated mto a vector, preferably by usmg a partial fiU-in reaction (see 1999 Stratagene catalog, page 56). A preferred vector is a member of the pcDNA3.1 (+) his series. The fragments are then expressed usmg conventional techmques. Preferably, the expression is performed usmg a Cos-7 transfection method (De Plaen E et al. In: Lefkowits I, ed. Immunology Methods Manual, v. 2. New York: Academic Press, 1997:691-718). The host ceU can be co-trans fected with a nucleic acid molecule, such as cDNA, encodmg a relevant HLA molecule, such as an HLA heavy chain. The HLA molecule enables a host ceU from a species (e.g., monkey in the case of Cos ceUs) differing from that of the T ceU source to recognize the antigen denved from the mfectious agent. The HLA molecule is selected to match the HLA molecule capable of presenting the target antigen Methods for identifymg the appropriate HLA molecule are descnbed in KoeUe, DM et al, J. Infectious Dis. 1994, 169:956-961; and DePlaen, E et al. In Immunology Methods Manual, 1997, Academic Press, 704-705. In the absence of a definitive identification of the presenting HLA molecule, cDNA encoding two or more candidate class I HLA molecules can be co-transfected. The abihty of the expressed polypeptide to ehcit a ceUular immune response is then assayed. Abihty to ehcit a ceUular immune response is indicative of the presence of an lmmunogenic epitope. Assays that can be used to detect abihty to ehcit a ceUular immune response include, but are not limited to, cytotoxicity assays and lymphokme secretion assays. In one embodiment, the assay is an interferon-gamma assay. In a preferred embodiment, the mvention provides a method for identifying HSV epitopes immunogemc for CD8+ T ceUs. The method compnses obtaining CD8+ T ceUs from an HSV lesion, and assaymg the obtamed T ceUs to identify T ceUs havmg abi ty to recognize HSV-mfected ceUs. The method further compnses obtaining and fragmenting a nucleic acid preparation from HSV, expressmg one or more fragments of the obtamed nucleic acid, and assaying the expressed fragments for antigemc reactivity with the identified HSV-specific T ceUs. An expressed fragment having reactivity with the HSV-specific T ceUs is identified as encodmg an HSV epitope immunogemc for CD8+ T ceUs. The mvention also provides a diagnostic assay. The diagnostic assay can be used to identify the lmmunological responsiveness of a patient suspected of havmg a herpetic infection and to predict responsiveness of a sub j ect to a particular course of therapy. The assay compnses exposing T ceUs of a sub j ect to an antigen of the mvention, m the context of an appropriate APC, and testing for lmmunoreactivity by, for example, measuring IFNγ, proliferation or cytotoxicity. Suitable assays are descnbed m more detail m the Examples. EXAMPLES The foUowmg examples are presented to lUustrate the present mvention and to assist one of ordinary skiU m making and usmg the same. The examples are not mtended m any way to otherwise limit the scope of the mvention Example 1 Detection of HSV-specific CD 8 CTL in recurrent genital HSV-2 lesions This example demonstrates that specific CD 8 CTL locahze to genital HSV-2 lesions This is shown by serial lesion biopsy studies of recurrent genital HSV-2 lesions using ceUs that have encountered antigen/APC in situ and are not restimulated with antigen in vitro prior to readout assays Materials <& Methods Lesion-infiltrating lymphocytes (LIL) were expanded for one cycle with phytohemaglutinin (PHA) and IL-2 m the presence of 50 μM acyclovir (ACV). TypicaUy, 5 X 10 6 -5 X 10 7 ceUs were obtained after two weeks The phenotype of these bulk populations has been described (KoeUe DM et al, J. Chn. Invest. 1998;101 :1500-1508). Among TCR αβ, CD3+ cells, there is a gradual shift to CD8 predominance as lesions mature and cultures become negative. Kesults The local response had high levels of NK-cell activity as determined by lysis of K562 and allogeneic, HSV-2 infected lymphocyte continuous hne (LCL) as early as day two of symptoms NK ceUs were selectively enriched in ceUs expanded from lesions compared to normal skin. HSV-specific CD4 ceUs were similarly enriched early. Lesions were enriched m both "Thl" (mterferon-gamma (IFN-γ), IL-12 p40, IL-2) and "Th2" (IL-4, IL-5, IL-10, IL-13) mRNAs (Van Voorhis WC et al, J. Infect. Dis. 1996;173:491-95). The cytokme pattern of lesion-infiltrating HSV-2-specιfιc CD8 CTL includes mterferon-gamma. In contrast to CD4 and NK activities, HSV-specific CTL infiltrated recurrent HSV-2 genital lesion at later times (typically days 5-9) and their presence correlated with virus clearance (KoeUe DM et al, J. Chn. Invest. 1998;101 :1500-1508). The CD4 and CD8 components were studied by subtracting NK and then either CD4 or CD8 ceUs. CTL activity was observed in either CD8 ceUs alone or in both subsets. EBV- transformed LCL (Tigges MA et al, J. Virol 1992;66:1622-34) were used as target ceUs in CTL assays because autologous ceUs are convenientiy made, HSV undergoes complete lytic replication in these ceUs, and high levels of HLA and co- stimulatory/adhesion molecules are present. HSV-specific CD8 clones (Table 1) have been isolated from herpetic vesicle fluid (KoeUe DM et al, J. Infect. Dis 1994;169:956-61) and lesions (KoeUe DM et al, J Chn. Invest. 1998;101 :1500-1508) Secondary restimulation with antigen was not used. Many (> 1,000) microcultures of CD8-enrιched cells were cloned at 0.3-2 cells/weU by standard methods (KoeUe DM et al, J. Chn. Invest. 1998;101 :1500- 1508) and ~ 200 clones were screened in CTL assays against autologous LCL with and without 18 hour infection with HSV-2 (multiplicity of infection, or MOI, 10) AU clones were CD3/8/TCR αβ (+) and CD4/TCR γδ (-) by flow cytometry. Table 1. Cytolytic activity of CD8 T ceU clones (TCC) from recurrent HSV-2 lesions. Lysis is percent specific release at an effector:target (E:T) ratio of 20:1 or lower. % specific lysis Epitope HLA restriction 2 location 1 Subject Bx Date TCC Mock HSV-1 HSV-2 RW 1997 51 0 1 87 0.0-0.12 B*4501 RW 1991 22 3 0 2 54 0.66-0.72 A*0201 location of epitope within standard map (Dolan A et al, J. Virol 1998;72:2010-21) of HSV-2 genome, epitope mapping for HSV-2 type-specific TCC uses HSV-1 X HSV-2 intertypic recombinant viruses (IRV) (Preston VG et al, J. Virol. 1978;28:499-517) as described (KoeUe DM et al, J. Virol. 1994;68:2803-10; KoeUe DM et al, J. Virol. 1998;72:7476-83). Boundaries are approximate. 2 HLA aUele restricting killing of HSV-2 infected, partiaUy matched LCL as described (KoeUe DM et al, J. Infect. Dis. 1994;169:956-61); serologic or DNA definitions as permitted by method of typing. kRW22. RW22 and RW.1991.22 refer to a T ceU clone derived from sub j ect RW in 1991. Two clones given the designation "22" were separately derived from RW in 1991. Throughout this application, the two separately derived clones are distinguished by dkRW22 and cpRW22. To measure diversity of the CD8 response, TCR Vβ analysis was performed on bulk, positively selected CD8+ cells from LIL expanded one cycle with PHA (the source culture for CD 8 CTL clone RW51, Table 1 and below), as weU as CD 8 ceUs from PBMC from the same donor. Total RNA (Chomczynski P et al, in: Cohgan JE et al, eds Current Protocols in Immunology. New York: John Wiley and Sons, 1992:10.11.7-10.11.14) was reverse transcribed with ohgo-dT primer and MMLV RT (Pharmacia). cDNA was used in 24 separate PCR reactions with Cβ primer and family-specific Vβ primers. After 30 cycles of PCR, an ahquot of each reaction was mixed with a fluorescent-labeled internal cβ primer and PCR continued for five cycles to label amphmers of rearranged TCRVβ genes. Primers and protocols were as described in Pannetier C et al, in: Oksenberg JR, ed. The antigen T ceU receptor- selected protocols and applications. New York: Chapman and HaU, 1998:Section 9. Analysis by ABI sequencer with fluorescent MW markers was done at the Biotechnology Core at Fred Hutchmson Cancer Research Center (Seatde, WA). The CD8 PBMC were very polyclonal as judged by the Poisson distribution and multiple peaks withm the TCR Vβ amphmer "ladders" (Figure 1A), while the lesion CD8 population appeared to be quite ohgoclonal (Figure IB). Similar results were obtained for another donor. These data are consistent with limited diversity of the local CD8 response in HSV-2 lesions. Example 2: Detection of HSV-specific T-ceU responses in cervical lymphocytes Mucosal immune responses are segregated from PBMC, and localization of HSV- specific CTL to the mucosa of mice is associated with protection from vaginal inoculation. This example demonstrates that HSV-specific T cells, including CD8+ ceUs, can be detected in cervical lymphocytes. CeUs from a representative cervical cytobrush specimen were coUected during an active genital HSV-2 outbreak and expanded in bulk with PHA/IL-2, and subsequently analyzed for HSV-specific prohferative (Figure 2A) and cytotoxic responses (Figure 2B). Proliferation and cytotoxicity assays used autologous PBMC or LCL as APC as described above for skin-derived lymphocytes. Anti-HLA class I mAb W6/32 or anti-HLA DR mAb L243 were used as described (KoeUe DM et al, J. Virol 1994, 68:2803-10; KoeUe DM et al, J. Infect. Dis. 1994, 169:956-61). Antigen-specific prohferative responses and cytotoxic responses were present. Fractionation and mAb inhibition studies show a contribution of CD8 CTL to the cytotoxic response. Example 3: Detection of HSV-specific T-ceU responses in primary genital HSV-2 lesions In this example, biopsy specimens were coUected from a patient presenting with symptoms consistent with primary genital HSV-2 infection. The phenotypes of the collected cells were determined, and LIL and PBMC from the specimens were subjected to prohferative and cytotoxicity assays. The results show that the HSV- specific prohferative and cytotoxic responses of CTL present in primary genital HSV-2 lesions are typical of those detected during recurrent disease. CW7477 developed dysuna, fever, buttock, and lower abdomen lesions three days after his last sexual contact. Lesions lasted 13 days and grew HSV-2. Acyclovir treatment was begun on day four of symptoms. Biopsies were done on days four and seven. Serostatus was atypical positive (only a few bands present on immunoblot) at day four, with more bands, but stiU less than most convalescent sera, on day 26, by enhanced chemuummescence (ECL; Dalessio J. and Ashley R, J. Chn. Microbiol. 1992, 30(4):1005-7) variant of type-specific HSV-2 immunoblot. The chmcal and laboratory data were consistent with primary genital HSV-2 infection. Biopsy specimens were obtained on day four and seven of symptoms and bulk LIL expanded with PHA/IL-2 as described above. The phenotype of the expanded ceUs was spht between CD4 and CD8 ceUs, with 15- 25% CD3+/CD16,56+ ceUs and 5-10% TCR γδ + cells m the LIL. In comparison, cells from normal skin had almost no CD 16,56 (+) events and no TCR γδ ceUs. The nature of the CD3+/CD16,56+ ceUs is unknown but these are frequendy seen in expanded LIL. The antibody cocktail has a combination of αCD16-PE and αCD56- PE. Table 2. Functional activity of bulk LIL or PBMC from human primary genital HSV-2 infection proliferation 1 c vtotoxicitv 2 resp onder effector day 4 day 7 day 4 day 15 day 4 day 7 day 4 dav 4 lesion lesion normal PBMC lesion lesion normal lesion antigen skin target skin CD8+ media 203 587 153 1,092 au 2 9 2.2 4.3 1.1 mock mock virus 187 775 146 1,296 au 16 2 28.3 2.9 1:100 HSV-1 UV HSV-1 12,926 26,328 143 au 48 3 29.8 4.4 67.5 1.100 HSV-2 UV HSV-2 12,685 14,481 152 20,179 au vac -2.5 4.8 2.3 1:100 t gB2 1 16,416 23,351 234 15,282 au 15.8 16 8 -5.2 μg/ml vgB2 gD2 1 8,750 13,392 216 3,976 au 5 1 13 1 2 1 μg/ml vgD2 VP16 1 816 8,689 166 au 3 0 6.6 2.1 μg/ml vVP16 PHA 0.8 12,795 22,318 41,229 59,691 al 1.0 5.9 2 8 μg/ml mock al 3 6 4.5 2 7 HSV-2 K562 1 1 69.2 2.1 10 4 ] Bulk ceUs were used at 10 4 /weU with autologous irradiated PBMC (10 5 /weU) as APC. Results are mean cpm 3 H thymidme incorporation on day 4. Day 15 PBMC used at 10 5 hve ceUs/weU. 2 Bulk ceUs used at 20: 1 effector:target ratio m 51 Cr release versus autologous (au) or HLA mismatched (al) LCL infected 18 h, MOI 10 as indicated (v=vaccιnιa) . CD8+ ceUs enriched by MidiMacs™ (MUtenyi). Results are % specific release; spontaneous release < 22%. The HSV-specific prohferative and cytotoxic responses were fairly typical of those detected during recurrent disease (KoeUe DM et al, J. Chn. Invest. 1998; 101 :1500- 1508). Cross-reactive responses to HSV-1 and HSV-2 were present, as were antigen- specific responses to HSV glycoproteins. Normal skin responses were low, and PBMC responses were developing by day 15. Example 4: Identification of an ICPO antigen recognized by HSV-specific CD8 CTL This example demonstrates, via expression cloning, the antigenicity of ICPO. In particular, an epitope within amino acids 92-101 of ICPO is identified. In addition, the antigenicity of ICPO is confirmed using vaccinia. The amino acid numbering uses the nomenclature and numbering of Dolan et al, J. Virol 1998, 72:2010-21. Materials <& Methods The Cos-7 expression cloning method of Boon et al. was used for expression cloning (De Plaen E et al. In: Lef owits I, ed. Immunology Methods Manual, v. 2. New York: Academic Press, 1997, 691-718) Interferon-gamma secretion was tested as a CD8 T- ceU readout by plating 1 X 10 4 washed autologous LCL stimulators (mock- or HSV-2 infected at MOI 10 for 18 hours) and 5 X 10 4 responder TCC in triphcate for 24 hours in 200 μl TCM (Tigges MA et al, J. Virol 1992, 66:1622-34). Libraries used pcDNA3.1 (+)hιs A, B, and C (Invitrogen) as expression vectors. These specific vectors have an intrinsic ATG start 5' to the multiple cloning site (MCS), yielding fusion proteins of a leader peptide and a viral polypeptide fragment. There is a 1 /6 chance any viral DNA fragment will be forward and "m-frame" with the ATG. Therefore, three vectors (A, B, and C) are used with an extra 0, 1, or 2 bp between ATG and the MCS. Libraries were made from HSV-2 strain HG52 DNA purified (MacLean AR. In. Brown SM, MacLean AR, eds. Methods m Molecular Medicine: Herpes Simplex Virus Protocols, v. 10 Totowa, NJ: Humana Press Inc., 1998, 19-25) from Vero ceUs. The ~ 155,000 bp genome was digested with Sau3A I, predicted to give 456 fragments averaging several hundred bp long. Ends were partiaUy filled-in and fragments hgated to Xba I-digested, partiaUy filled-in, dephosphorylated A, B, and C vectors in separate reactions for primary hbraries. Partial fill-in prevents hgation of >1 insert/vector. Contamination with ceU DNA was not detected in 20 random clones. Primary hbraries were amplified immediately and saved as ahquots. The goal of six- fold genomic oversamphng was met, assuming each hbrary was only 1 /6 forward and m-frame: each primary hbrary had > 15,000 transformants. Three thousand clones per hbrary were studied. Libraries were titered and dduted to 15 clones/weU in deep microtiter plates. DNA was purified (Milhpore 96-weU format; sihca chemistry) after 18 hr rotation at 300 rpm, 37°C. Yields averaging 10 μg/weU (spectrophotometer) were obtained, enough for many future screens. Lesion clone RW51 (Table 1) was chosen for expression cloning. The HLA restricting allele of CD8 TCC RW51 is B45 as LCL matched only at B45 were lysed in CTL assays. HLA B*4501 cDNA was cloned by RT-PCR. cDNA synthesis used total RNA from RW LCL (Chomczynski P, Sacchi N. In: Cohgan JE et al, eds. Current Protocols m Immunology. New York: John WUey and Sons, 1992, 10.11.7-10.11.14), ohgo-dT primer and MMLV RT (Pharmacia) with standard protocols (Sambrook J et al. Molecular Cloning: a laboratory manual, v. 2, New York: Cold Spring Harbor Press, 1989). HLA B*4501 PCR product (primers AAGGTACCATGCGGGTCACGG CACCCCGAA and GGTCTAGAAGTTCGACACTCTCTGTGTAGT: Kpn I and Xba I sites marked: SEQ ID NO: 4 and 5, respectively) was digested, cloned into pcDNA 3.0, and sequenced. It was identical to Genbank 61710 for B*4501. Expression was checked with FITC-labeled, aUele-specific mAb B12 (One Lambda, Inc.). At 48 hours, 40% of transfected (Fugene 6, Boehrmger Mannheim) Cos-7 expressed surface HLA B45 by flow cytometry compared to < 1% for vector. HLA A*0201, the restricting aUele for CD8 TCC RW3 and dkRW22 (Table 3), was similarly cloned and expression documented with mAb MA2.1 (McMichael AJ et al. Human Immunol. 1980, 1:121-29). To screen hbraries for the antigemc protein, Cos-7 cells plated (7,000/weU) in flat microtiter plates were co-transfected after 24 hours with hbrary pool and B*4501 DNA (50 and 25 ng/weU). Cloned RW51 T-ceUs (5 X 10 4 /weU) were added 48 hours later. Supernatant (24 additional hours) interferon-gamma ELISA (lower limit of detection, ~ 2 pg/ml) was done with matched mAb pair (Endogen). Two to four positive pools were found in each reading frame hbrary (A, B, and C). Bacteria from positive pools were plated, colonies picked, and DNA made for the next round of assay. AU positive clones had identical 1164 bp HSV-2 Sau3A I inserts (Figure 3) containing exon 1, lntron 1, and some of exon 2 of the HSV-2 ORF encoding IE protem ICPO. Another 445 bp of genomic DNA 5' to the ATG start of ICPO was present. Representative positive clone A1:H3:B8 was selected for further study. The positive genomic clones in both A and B reading register hbraries, and the presence of three stop codons in-frame with the vector ATG and preceding the ICPO ATG in both the A and B hbrary positive clones, argues for use of the HSV-2 promoter rather than the vectors' CMV promoter. Constitutive promoter activity by 5' elements in the absence of VP16 (αTIF) and the "viral context" can occur for HSV-1 ICPO. To find the epitope, an examination was made as to whether and how HSV-1 ICPO mRNA was sphced m the Cos-7 ceUs. ICPO mRNA is one of a few sphced HSV genes; alternative splicing has been reported. Total RNA from Cos-7 ceUs transfected with the (+) genomic fragment A1 :H3:B8 (Table 4) and MMLV RT were used to make cDNA with primer C (Figure 3). Primers A at the translational start and primer C were then used in PCR. The sequences of eight cDNA clones aU showed sphcing. The acceptor site was 3 bp 3' to the pubhshed site, removing amino acid Q26. To narrow down the epitope, A-C (exonl , start of exon 2) and A- B (exon 1) PCR products were cloned into the proper pcDNA3.1 -based vector for in- frame expression. The exon-1 -exon 2 clone was positive but the exon 1 clone was negative (Table 4) when tested for reactivity with T-ceU clone RW51. A vaccinia-ICPO (Manickan, E et al, J Virol. 1995, 69(8):4711 -4716) was used to confirm the expression cloning identification of ICPO (Figure 4). Results AU HSV-specific CD8 clones released IFN-γ in a specific manner (Table 3). In addition, the utihty of the interferon-gamma assay was examined as a confirmatory test for HLA restriction. Clone RW51 specificaUy released mterferon-gamma after exposure to Cos-7 cells transfected with HLA B*4501, but not with A*0201, and infection with HSV-2 (Table 3). Table 3. Interferon-gamma secretion (pg/ml by ELISA) from lesion-derived HSV- specific CD8+ TCC (RW51). stimulator responder TCC autologous LCL mock <5 autologous LCL HSV-2 440 Cos-7 A*0201 /HSV-2 <5 Cos-7 B*4501 /HSV-2 600 Table 4. Secretion of interferon-gamma of CD8 TCC RW51 in response to Cos-7 cells transfected with various DNAs (or peptide loaded at 1 μM) measured by ELISA in pg/ml Responses of 5 X 10 4 TCC to 7 X 10 3 Cos-7 ceUs checked at 24 hours. HSV-2 DNA or peptide HLA class I emptv pool clone ICPO ICPO ICPO 92- cDNA vector A1 :H3 A1 :H3:B8 exon 1 exon 1.2 105 empty not done not done <2 <2 <2 <2 vector B*4501 <2 420 >600 <2 >600 1,100 To choose peptides efficiently, a HLA B45 binding motif was derived from B45- restncted peptides, and pool sequence from peptides eluted from B*4501. The motif is glutamic acid at position 2, hydrophobic at position 10 (PI and P9 in "binding" nomenclature (Rammansee H-G, Current Opinion in Immunology 1995, 7:85-96)) Peptide ICPO 92-105 (AERQGSPTPADAQG; SEQ ID NO: 19) was active m CTL (Figure 4) and interferon-gamma (Table 4) assays. Other candidate exon 2 peptides were not. The high EC50 value (~ 1 μM) may be due to the carboxy-termmus tail predicted to he outside the peptide-binding groove and reduce binding to HLA B*4501. Vaccinia-ICPO from B. Rouse (Mamckan E et al, J. Virol 1995, 69:4711-16) was grown and titered (KoeUe DM et al, J. Virol 1994, 68:2803-10). Clone RW51 specifically lysed vac-ICPO targets (Figure 4). The availability of the vaccinia was fortuitous, and not required to confirm the result of expression cloning. To narrow down the epitope, a peptide comprising amino acids 92-101 of ICPO (AERQGSPTTP; SEQ ID NO: 6) was synthesized. The IC50 for this peptide is between 1 and 10 nanomolar (Figure 5). To confirm that patients with HSV-2 infection have T-ceUs reactive with the newly discovered T-ceU antigen circulating in their peripheral blood, peripheral blood mononuclear cells (PBMC) from the patient from whom the lesion-derived clone RW51 was recovered were peptide stimulated. PBMC were cultured for three days at 2 x 10 6 cells per 1.88 cm 2 well in 2 ml of T-ceU medium containing 1.0 μg/ml peptide HSV-2 ICPO 92-101. On the fourth day, IL-2 (32 units/ml) was added. On the eighth day, the cells were washed and restimulated in the same size well with an additional 2 x 10 6 autologous, irradiated (3300 rad gamma irradiation) PBMC, 1.0 μg/ml of the same peptide, and IL-2 (32 U/ml). Responders were cultured for an additional nine days in the presence of IL-2 and expanded as necessary. Cytotoxicity assay was performed using autologous or HLA class I-mismatched LCL treated either with nothing, peptide HSV-2 ICPO 92-101 at 1 μg/ml for 18 hours, or infection with HSV-2 strain 333 at MOI 10 for 18 hours. The cytotoxicity assay was a standard four-hour 51 Cr release assay. The results (Figure 6) show that stimulation of PBMC with peptide HSV-2 ICPO 92- 101 was able to stimulate ceUs with cytotoxicity towards HSV-2 infected ceUs, and that this activity was not present against HLA class I-mismatched ceUs. For comparison, the index T-ceU clone RW51 was also used as an effector ceU m this assay and displayed comparable, although slightly higher, cytotoxicity at the effector to target ratio of 10:1 shown in Figure 6. Example 5. Identification of an Uτ.47 antigen recognized by HSV-specific CD8 CTL This example demonstrates, via expression cloning, the antigenicity of an HSV polypeptide encoded by DNA contained within the coding region for protein UL47. Expression cloning and hbrary preparation were as described in Example 4. Lesion clone dkRW22.1991 was chosen for expression cloning. This clone has cytolytic activity against HSV-2 infected, autologous LCL (Table 1). The HLA restricting aUele of CD 8 TCC dkRW22.1991 is HLA A*0201, as Cos-7 ceUs transfected with HLA A*0201, but not B*4501, and then infected with HSV-2, specificaUy stimulated mterferon-gamma release from dkRW22.1991 (Table 5). Clone dkRW22.1991 has the foUowmg phenotype by flow cytometry: CD3(+), CD4(-), CD8(+), CD16 and 56(-), and T-ceU receptor α/β(+). Results To screen hbraries for the antigemc protem, Cos-7 ceUs plated (9,000/weU) m flat microtiter plates were co-transfected after 24 hours with hbrary pools and A*0201 DNA (50 and 25 ng/well). Cloned T-ceUs were added 48 hours later, and interferon-gamma assay performed on 24 hour supernatants as described for Example 4. One positive pool in the hbrary from pCNA3.1-hιs C was found. Bacteria from this pool were plated and DNA made from 96 colonies for the next round of assay. One positive clone, designated C1F1C7, was found in a foUow-up round of mterferon-gamma release assays. Sequencing of the viral insert revealed that it was a 1.4 kb Sau3a I fragment of the HSV-2 genome from nucleotides 102875 to 101383. The sequences encode the C-terminal region of HSV-2 U 47 from amino acids 292 to 696, a short mtervemng region, and then the N-terrmnal 70 am o acids of HSV-2 U 46. To partiaUy narrow down the region of HSV-2 DNA encoding the antigemc epitope, the fuU length genes for U L 47 and U L 46 of HSV-2 were cloned by PCR using a thermostable DNA polymerase with proofreading function (pfu, Invitrogen). The primers were CTAGGATCCCCTCCGGCCACCATGTCC (5' primer; SEQ ID NO: 7) and CGATCTAGACCTATGGGCGTGGCGGGC (3' primer; SEQ ID NO: 8) for U L 47, and CGAGGATCCGTCTCCGCCATGCAACGCCG (5' primer; SEQ ID NO: 9) and CGCTCTAGATTTTAATGGCTCTGGTGTCG (3' primer; SEQ ID NO: 10) for U L 46. In each case, the 5' primer contained an incorporated Ba H I site (underhned) and the 3' primer contained an incorporated Xba I site (underhned) to facilitate cloning. The PCR products were digested with BamH I and Xba I and cloned into pcDNA3.1-hιs-C to yield in both cases in-frame fusion proteins. The sequences m the fusion regions at the 5' ends of the HSV-2 genes into pcDNA3.1-hιs-C were confirmed by sequencing. In addition, aU of the U L 46 coding sequences contamed withm the original positive clone C1F1C7 were deleted by restriction digestion and re-hgation The daughter construct is designated C1F1C7-Apa I(-). To test the reactivity of lesion-derived T-cell clone, Cos-7 ceUs were transfected with A*0201 DNA and either infected with HSV-2 or transfected with each of these constructs. The results are consistent with recognition of an antigen encoded by the DNA encoding U L 47 of HSV-2. The clone C1F1C7-Λpa I(-) was positive. Because this clone is deleted of aU U L 46 sequences, U L 46 IS not being recognized. In addition, the transfection of full-length U L 47, but not U L 46, together with HLA A*0201 into Cos-7 cells yielded cells that specificaUy stimulated mterferon-gamma secretion by clone dkRW22.1991. Table 5. Secretion of mterferon-gamma by TCC dkRW22.1991 in response to Cos-7 ceUs transfected with functional HLA class I heavy cham cDNAs and infected with HSV-2 at multiplicity of infection of approximately 5. HLA cDNA none A*0201 A*0201 B*4501 hve HSV-2 none none HSV-2 HSV-2 IFN-γ, pg/ml <10 <10 >600 <10 Table 6. Secretion of interferon-gamma by clone dkRW22.1991 m response to Cos- 7 ceUs transfected with HLA A*0201 and either infected with HSV-2 as a positive control or co-transfected with eukaryotic expression vectors containing specific segments of the HSV-2 genome. HLA cDNA None A*0201 A*0201 A*0201 A*0201 A*0201 Live HSV-2 None None None None None None HSV-2 DNA None None C1F1C7 C1F1C7 Apa I (-) U L 47 U L 46 IFN-γ, pg/ml <10 <10 >600 >600 >600 <10 Example 6 Identification of amino acids 289-298. 551-559 and 551-561 of Uι.47 as antigens recognized by HSV-specific CD8 CTL Materials <& Methods CeU hnes and viruses: EBV-LCL were made from PBMC m-house; ARENT, PITOUT, HERLUF, and KASOl 1 were obtained from G. Nepom. HSV-1 El 15 and HSV-2 333 and HG52 and recombinant vac-ICPO-HSV-2 (provided by B. Rouse) and wild type vaccinia NY were raised and tittered m Vero or BSC-40 ceUs. HSV-specific T-ceUs were obtained from HSV-2 culture-positive buttock lesions Biopsies were taken on lesion day 5 or from herpetic vesicle fluid. Lymphocytes were expanded in bulk with PHA and IL-2. CD 8 ceUs were selected with lmmunomagnetic beads (Mmimacs, Miltenyi) and cloned. For subject HV, biopsy tissue was digested for five hours at 37°C in CoUagenase IV-S (Sigma) and the resultant ceU suspension cloned in serial 10-fold dilutions. Clones were expanded with anti-CD3 mAb, IL-2, and feeders. Peptide-restimulated PBMC-derived lymphocytes were made by incubating 4 X 10 6 PBMC with 1 μg/ml peptide. After three days, 10 U/ml human recombmant IL-2 (Chiron) was added. After seven days, responders were washed and re-plated with 2 X 10 6 freshly thawed, irradiated autologous PBMC, peptide, and IL-2. Cells were assayed on day 14-21. Expression cloning: HSV-2 genomic DNA was digested with Sau3A I, re-extracted, and partially filled in with Klenow fragment, dTTP and dCTP. Plasmids pcDNA3.1 (+) myc-his A, B, and C (Invitrogen) were digested with Xho I and partiaUy fiUed in with dATP and dGTP. After ligation, DNA was electroporated into E. coli strain DH10B. Each hbrary had several thousand primary trans ormants. The majority of each hbrary was immediately amplified in bulk (4 ml LB-amp, overnight) and ahquoted. 20 random clones each contained single HSV-2 Sau3A I fragments. To make DNA for transfection, deep 96-weU plates were inoculated either with hbraries at —15 colonies/weU, or with selected individual clones. After overnight growth, DNA was prepared with 96-weU filters. To make HLA A*0201, B*4402, B*4403, and B*4501 cDNA, total RNA was extracted from LCL. cDNA was prepared with oligo-dT and MMLV reverse transcriptase. PCR used pfu DNA polymerase, 2.5 mM (each) dNTP, cDNA, and primers designed to complement the heavy chain gene and containing distal Kpn I or Xba I sites. Amphmers were digested Kpn I and Xba I and hgated into pcDNA3.0. Insert sequences were identical to Genbank. To study the cDNA species derived from the positive genomic clone containing portions of ICPO (below), Cos-7 cells were transfected with the ICPO genomic clone, and total RNA prepared after 48 hours. The primer used for cDNA synthesis (TGCTCTAGAGACTCGATCCCTGCGCGTCGG, Xba I site underhned; SEQ ID NO: 11) was derived from the sequence of the 3' end of the HSV-2 DNA in the ICPO genomic clone. MMLV reverse transcriptase was used. To examine sphcing, PCR sedpfu polymerase, cDNA, the above 3' primer, and 5' primer TAAGGTACCTGAACCCCGGCCCGGCACGAGC (Kpn I site; SEQ ID NO: 12). To isolate exon 1 of ICPO, PCR used the same 5' primer and 3' primer TGCTCTAGACCAGGCGTGCGGGGCGGCGGG (Xba I site; SEQ ID NO: 13). Product was cloned into pCDNA3.1-his-B. FuU-length U 47of HSV-2 was PCR-cloned into pCDNA3.1-his-C using the same primer identified above (SEQ ID NO: 7, 8). FuU-length U L 46 of HSV-2 was PCR- cloned into pcDNA3.1-his- C with the corresponding primers identified above (SEQ ID NO: 9, 10). Similarly, constructs expressing amino acids 1-595 and 1-640 of U 47 were made by PCR, using the above 5' primer, appropriate 3' primers, and pCDNA3.1-his-C. Constructs UL47 1-535 and 536-696 were made using a natural Not I site at aa 535. In-frame fusion was confirmed by sequencing. Lymphocyte functional assays: CTL assays were done by standard 4-hour 51 Cr release. Target EBV-LCL were infected 18 hours with HSV at MOI 10; effector:target ration was 20:1. Anti-class I mAb W6/32 was used at 10 μg/ml. Actinomycin D was used a 5 μg/ml for 30 min. pre-infection, during 90 minute infection, wash, and assay periods to study the effect of inhibition of viral RNA expression. IFN-gamma secretion by HSV-reactive CD8 CTL was used as the endpoint to confirm isolation of functional HLA cDNA and for expression cloning. Cos-7 ceUs seeded on day one at 9,000 ceUs/weU in 96-weU flat-bottom plates were transfected on day two with 50 ng HLA cDNA (Fugene-6). On day three, ceUs were infected with HSV-2 333. On day four, 0.7-1.0 X 10 5 cloned CD8 T-ceUs were added. Supernatants were saved on day five. To screen hbraries, Cos-7 were co-trans fected with 50 ng HLA cDNA and 100 ng of hbrary DNA (pools of 15, or single colony). Two days later, 1 X 10 5 cloned T- cells/weU were added and supernatants saved after 24 hours. Positive pools were broken down to identify active bacterial clones. The HSV-2 DNA in active clones was sequenced. Flow cytometry: Lymphocytes were stained with labeled mAb to CD3, CD4, CD8, CD16/56, TCR αβ, or TCR γδ by standard methods. To measure HLA expression in transfected Cos-7 cells, trypsinized cells were mixed with 1 μg FITC-labeled mAb B12 reactive with HLA B*450l (One Lambda, Inc. or supernatant of mAb MA2.1 ceUs reactive with HLA A*0201, foUowed by FITC-labeled goat anti-mouse IgG. HLA typing: For definition of HLA B44 aUeles, direct sequencing of variable exons was performed. ELISA: Gamma-interferon was measured by ELISA with reagents from Endogen. Plates were coated with 100 μl of 0.25 μg/ml capture mAb M700A-E and blocked with 1% BSA in 0.2 M NaCl, 3mM KC1, 0.05 M Tris, pH 9 (TBS) for one hour. Subsequent incubations were each 100 μl, preceded by 3-5 washes with PBS/0.2% Tween-20, and performed with rotation at room temperature. Samples and 0 standards diluted in TBS with 0.1% BSA, 0.05% Tween-20, and 4 μg/ml Immunoglobuhn Inhibiting Reagent #6LD1068 (Bioreclamation, Inc., East Meadow, New York) (sample buffer) were added for 2 hours. Biotinylated detection mAb (M701B) diluted to 100 ng/ml in sample buffer was added for one hour. AvidinD:HRP (A-2004) dUuted to 100 ng/ml in TBS with 1% BSA, 0.05% Tween-20 5 was added for one hour. TMB substrate was added for 10 minutes. Lower limit of detection ranged from 2 to 10 pg/ml. Results are shown in Figures 7-10 and in Tables 7-9. Table 7 autologous HLA partiallv HLA matched 2 mismatched 1 T-cell clone mock HSV-1 HSV-2 HSV-2/ mock HSV-2 allele mock HSV-2 Act D 3 dkRW.1997.51 1 3.7 73.6 45.1 2.9 4.5 B*4501 0 61.8 dkRW.1991.22 1.2 0.1 38.3 12.1 0 0 A*0201 3.3 65.2 HV.1999.23 6 0 56.6 35.8 2.5 2.1 A*0201 0 33.4 Table 8 T-cell clone HLA genomic HSV-2 sequence HSV-2 ORF(s) amino cDNA clone (nucleotides) acids dkRW.1997. B*4501 A1:H3:B8 1,858-3,022 ICPO 1-105 51 dkRW.1991. A*0201 C1:F1:C7 102,875-101,383 UL47 299-696... UL46 22 1-71 HV.1999.23 A*0201 C2:C10:B9 102,943-102,875 UL47 278-298 Table 9 HLA class I aUeles Lysis EBV-LCL HLA A HLA B uninfected HSV-2-infected autologous *01, *0201 *08, *57 9.1 70.4 CW 7477 *0301, *11 *4402, 1801 70.3 94.2 HERLUFF *02 *4402, 35 60.0 nd 2 HH 7894 *03, *31 *4402, *1524 77.2 75.5 KK 6806 *02, *03 *4402, *2705 57.4 62.3 PITOUT *2902 *4403 71.0 51.2 MK 8080 *03, *30 *4405, *39 2.6 1.0 The results show that lesion-infiltrating CD8 CTL recognize immediate early (ICPO) or virion input (UL47) proteins as predicted by ACT D inhibition and HSV-encoded TAP and trans crip tional inhibitors. Moreover, HSV-2 U L 47 289-298/A*0201- specific CD8 CTL cross-react with HLA B*4402 and B*4403, but not B*4405. The TCR may recognize these B44 aUeles plus a "housekeeping" peptide, currently unknown, present within B ceUs and also human and primate renal epithehal ceUs. The data suggest that cross reactive T-ceUs could mediate GVHD when stem ceUs from a A*0201 /not B*4402 or *4403 person are placed into a A*0201, HSV-2 infected person as weU as graft rejection when a B*4402 or *4403-bearing organ is placed into a A*0201 , HSV-2 infected person. Example 7: Identification of amino acids 548-557 of Ut,47 as antigens recognized by HSV-specific CD 8 CTL CD8+ T ceU clone cpRW22 (separately derived from same source as dkRW22) was tested against a series of synthetic peptides predicted to bind to HLA-A2 and derived from the HSV-2 gene UL47. One of these peptides was positively recognized by cρRW22 in an IFNγ ELISPOT assay. The sequence of the U L 47 peptide that scored positive was: NH2-RLLGLADTW-COOH (SEQ ID NO: 18), which peptide contains amino acids 548-557 of UL47. A series of 10-mer (U L 47/549-558, 550-559, 551-560 and 552-561) and 9-mer peptides (Uι.47/548-556, 549-557, 550-558, 551-559 and 552-560) that overlapped U 47/548-557 was prepared to better define the optimal target peptide. One 9-mer (U L 47/551-559) and two 10-mers (U L 47/550-559, 551-560) scored strongly positive at low concentrations in an ELISPOT assay (Figures 11A & 11B). The UL47/550- 559 and UL47/551 -559 peptides had similar activities at all peptide concentrations tested. Example 8: Identification of amino acids 550-559 of Uj 47 as a naturally processed antigen To determine the naturally processed UL47 peptide, A2-molecules were purified from 1.5 x 10 10 C1R-A2/3D9.6H7 cells and the bound peptides stripped by acid elution. These peptides were fractionated on an HPLC column under the following conditions: TFA ion-pairing agent; 0-10% acetonitrile (ACN) over 5 mins, 10-45% ACN over 50 mins, 45-60% ACN over 5 mins. These fractions were tested for the abihty to sensitize T2 targets for recognition by cpRW22 T ceUs in an IFN-gamma ELISPOT assay. Targets were T2 cells (20,000) pulsed with 5% of each fraction in serum-free medium + 3 μg/ml HuB2M at 32°C for 4 hours. The targets were then washed twice and transferred to duphcate weUs (10,000/weU) of ELISPOT plates. Responders were CTL clone cρRW22 (20,000/weU). Fractions 17, 18 and 23 were found to contain this activity (Figure 12). Fractions 17 and 18 were sub fractionated on the HPLC column under the foUowing conditions: HFBA ion-pairing agent; 0-10% ACN over 5 mins, 10-35% ACN over 50 min, 35- 60% ACN over 5 mins. Subfractions 24 and 25 were found to sensitize T2 ceUs for recognition by cpRW22 (Figure 13B; compare Figures 13A & 13C). Fraction 23 was subfractionated by HPLC in the same manner. Subfraction 37 was found to sensitize T2 cells for recognition by cpRW22 in an IFN-gamma ELISPOT assay (Figure 14). The U L 47/551-559, 550-559, and 551-560 peptides were run on the HPLC under the subfractionation conditions and found to elute in fractions 37 (U 47/550-559; Figure 15A), 40/41 (U 47/551-560; Figure 15B), and 32 (U L 47/551- 559; Figure 15C). The UL47/550-559 elutes in the same fraction (37) as does the naturaUy processed peptide from C1R-A2/3D9.6H7 cells, and is therefore likely to have the same sequence as the naturaUy processed peptide. The MS/MS data for Fraction 23/Subfraction 37 shows the presence of a peptide with a molecular mass of 961 (Figure 16). The molecular mass of UL47/550-559 is also 961. This provides supportive evidence that UL47/550-559 is the naturally processed UL47 peptide. The amino acid sequence of the U L 47/550-559 peptide is LGLADTWAC (SEQ ID NO: 1). It was subsequently verified that a gene fragment of HSV-2 that could encode the U L 47/550-559 peptide is contained within C1R-A2/3D9.6H7 ceUs. This was done by performing PCR with primers made to flanking regions of the cloning site of the pBIB retroviral vector and to the DNA sequence encoding U 47/550-559 (Figure 17). Using these PCR primers and varying the PCR conditions, it was demonstrated that the C1R-A2/3D9.6H7 ceUs contain at least two retroviral inserts derived from HSV-2 (Figures 18A-C). One insert encodes two fragments of the U 52 gene. The second insert encodes a large portion of the U 47 gene, including the portion encoding the UL47/550-559 peptide. Example 9: Methods for identifying proteins recognized by HSV-specific CD8 CTL This example demonstrates how one can identify additional proteins recognized by HSV-specific CD 8 CTL using lesion-derived material. Isolation of HSV-specific CD 8 T-cells from genital/ buttock HSV-2 lesions Punch biopsies (3-4 mm) are taken from perirectal, buttock and/or thigh skin after cleansing and anesthesia. Lesions from suspected primary herpes are biopsied as soon as possible, and serial biopsies at least twice during primary infection are preferred. Recurrent genital HSV-2 lesions in healing stages (late ulcer/crust) are preferred for antigen/epitope discovery as LIL from such lesions have high CTL activity. Portions of lesions can be snap frozen in isopentane/liquid nitrogen in OCT media for immunohistology. A portion of the biopsy is dissociated and cells grown in limiting dilution, and a portion used for bulk culture (KoeUe DM et al, J. Clin. Invest. 1998, 101:1500-1508). LIL are expanded in bulk by mincing tissue and stimulating with 0.8 μg/ml PHA and 7.5 X 10 5 feeders PBMC/well in 48-weU plates in T-ceU medium with acyclovir (50 μM). Expansion is assisted by IL-2 (50 U/ml, Hemagen) and usually yields 1 - 5 X 10 7 ceUs in 14-21 days. CTL activity of CD8- selected cells is tested against autologous and aUogeneic mock- and HSV-2 infected LCL in 4-hour 51 Cr release assays at effector:target 20:1 (Tigges MA et al, J. Virol. 1992, 66:1622-34). Lytic activity at this stage is predictive of recovery of HSV- specific CD8 CTL clones. To increase the recovery of rare CD8 CTL or CTL that might have a growth disadvantage in bulk culture, one can bypass the initial bulk expansion step. HSV-2 lesions are vesicular during the mid-phase of lesion evolution. HSV-specific CD8 CTL can be cloned from vesicle fluid as foUows. Vesicles are broken and fluid recovered with ceU scrapers into medium. A portion is used for cytospin preps (preserved at -70°C after fixation). After FicoU underlay and standard density gradient centrifugation, ceUs at the interface are washed and plated in serial dilutions from 100 to 1 ceU/weU in 96-weU U bottom plates together with cloning cocktaU (below). The ceU recovery from vesicles is typicaUy about 1 X 10 4 -2 X 10 5 per lesion. T-ceU cloning uses established procedures (KoeUe DM et al, J. Infect. Dis. 1994, 169:956-61). CD8-selected ceUs from a round of bulk expansion of LIL are seeded at 2 and 0.3 cells /well. Cells from freshly disrupted lesion biopsies or vesicle fluid are plated in a modified limiting dilution scheme starting at 30-100 ceUs/weU and decreasing at 2-3 fold steps down to 1 ceU/weU as reported in KoeUe et al, 1994, supra. For CD8-enriched fresh LIL and vesicle ceUs, a portion can be expanded in bulk (KoeUe DM et al, J. Clin. Invest. 1998, 101:1500-1508). Microcultures are fed twice weekly with IL-2 and screened at ~14 days. The percent of weUs showing growth at each input number is recorded to estimate the probability of clonality of microcultures. Screening candidate cultures A preferred screen for candidate cultures is a spht-well CTL assay against autologous LCL infected (18 hours, MOI 10) by HSV-2 or uninfected. LCL are EBV- transformed B-cell hnes (KoeUe DM et al, J. Clin. Invest. 1993, 91:961-68; MiUer G et al, Proc. Nad. Acad. Sci. USA 1972, 69:383-87) that take about six weeks to establish from PBMC. LCL are permissive for HSV infection, but are relatively resistant to HSV-mediated HLA class I downregulation in comparison to dermal fibroblasts. Most subjects are enroUed and LCL made prior to biopsy. LCL wiU therefore be avaUable when TCC are ready for screening. Preferably, the autologous HSV-2 are isolated, grown and titered on Vero ceUs (KoeUe et al, 1993, supra). For clones derived from bulk-expanded LIL, the cell input number yielding 37% or less of wells positive for growth are designated as probable "clones". Half of each microculture is plated in duphcate (final, 1 /8 of the culture/assay weU) with 2 X 10 3 targets for an effector:target ratio of ~ 15:1. Clones with a net lysis of HSV-infected targets of 15% above their lysis of uninfected targets are considered positive. Clones with CTL activity are analyzed by flow cytometry, and CD8-bearing CTL clones are expanded. Microcultures from fresh, disrupted lesion biopsies and vesicles wiU have been expanded in a limiting dilution format (above). Without the prior round of bulk expansion, there wul be less of a chance that microcultures wiU contain "sister" clones, although it is possible that identical ceUs may be independently recovered from the fresh lesion material in separate microcultures. Expanding cultures with CTL activity T-ceUs scoring positive in screening assays are expanded by the method of RiddeU et al. (Nature Medicine 1996, 2:216-23; U.S. Patent No. 5,827,642). The "leftover" half of cells in an original microculture well (~5 X 10 4 ceUs) is mixed in 25 ml T-ceU medium (KoeUe DM et al, J. Infect. Dis. 1994, 169:956-61) with 2.5 X 10 7 irradiated (3300 rad) mixed aUogeneic PBMC, 5 X 10 6 irradiated (8000 rad) LCL, and 30 ng/ml mAb OKT3 (anti-CD3). At 24 hours and then twice weekly, rhIL-2 (50 U/ml, Chiron, Emeryville, CA) is added. OKT3 is removed by washing on day four. Typically, the T-ceUs expand to ~l-5 X 10 7 ceUs at the end of the first cycle. A confirmatory CTL assay can be done when growth visibly slows at about 12 days. The cell number stored after an identical second cycle is essentiaUy unlimited, as a further 200-1000 fold expansion usuaUy occurs. Thawed aliquots of expanded ceUs work in CTL, proliferation, and cytokine assays. About 10-20% of clones fa to expand; loss of antigenic specificity is rare, but loss of replicative potential may occur. The Cos-7 co-transfection method described above can be used for expression cloning. DNA from the sequenced HSV-2 strain HG52 can be used, digested with Sau3A I and hgated into each member of the pcDNA3.1 (+) his series. The cDNA encoding the HLA class I heavy chains restricting the TCCs selected for expression cloning can be cloned, if necessary, by RT-PCR into pcDNA3.0 as described above. A universal method has been published (Ennis PD et al, Proc. Nad. Acad. Sci. USA 1990, 87:2833-37). Proof-reading polymerase can be used and cDNAs sequenced. Primers are aUele-specific perfect matches with "taUs" containing endonuclease sites not present in the target sequence. Undesired heavy chain PCR product (which may be co-amphfied) can be reduced by digestion of PCR product with an enzyme that preferentiaUy cuts the undesired cDNA. To test cDNA function, it can be 1) checked for ceU surface expression in 48 hour-transfected Cos-7 ceUs with aUele- specific mAb, and 2) checked for presentation of HSV-2 antigen presentation by the method iUustrated in Table 3 above. The expected results are specific staining of Cos-7 ceUs with aUele-specific mAb after transfection of heavy chain; empty vector and control mAb are included Specific stimulation of CD 8 TCC interferon-gamma secretion by Cos-7 cells transfected with the heavy chain and infected with HSV-2 is expected The number of clones screened per hbrary will depend on the number of restriction fragments generated in making the hbrary, but wiU typicaUy be several thousand Pool size (number of clones transfected per weU of Cos-7 ceUs) will start at ~ 15 viral DNA fragments /well Positive pools are broken down and individual clones tested Positive clones are sequenced and compared to the pubhshed HSV-2 sequence to identify antigens Epitope mapping Epitope mapping can be done with molecular, bioinformatic, and synthetic methods. Genomic hbrary screening (above) yields gene fragments as initial "positives" that range from 25 to 300 amino acids long The HSV-2 coding sequences in positive molecular clones can be shortened using standard methods, such as exonuclease III digestion (Gavm MA et al , J. Immunol. 1993, 151.3971-80) to make nested truncations of the HSV-2 insert or cleavage of HSV-2 DNA at internal restriction sites and reconstruction of plasmids It is preferable to use PCR with a proof-reading polymerase to re-amphfy a portion of the positive construct Truncations are designed for a 50-100 am o acid-long positive fragment For motif-matching peptides, the PI "anchor" is placed at residue 2 of synthetic peptides, since the N- terminal peptide at position "P minus 1" frequentiy faces "up" to the TCR and is required for T-cell triggermg If no motif is known, 15-mer peptides overlapping by five are made. Peptides are tested at 1 and 10 μM in CTL and/or interferon-gamma assays. If these methods do not find the epitope, further molecular "trimming" from both ends of the active HSV-2 construct can be done to find the minimal coding sequence (Schneider J et al , Int J. Cancer 1998, 75-451-58) If this peptide still is not positive in CTL assay, it may be that post-translational modification is required The peptide predicted to be positive by molecular genetic methods is loaded into the APC by electroporation or osmotic shock (Chen W et al, J. Immunol. Methods 1993, 15:49-57). Example 10: ICPO stimulation of CTL responses in additional HLA-B45 subjects This example demonstrates that other HLA-B45 positive donors have detectable CD8+ T ceU responses to the previously defined ICPO 92-101 peptide. Peptide restimulation in bulk format are appropriate for sensitive detection of CTL, whUe lesion derived antigen (LDA) formats yield CTL levels, but require prolonged ceU replication for detection. In this example, 4 X 10 6 PBMC in 2 ml T-cell medium were stimulated with 1 μg/ml HSV-2 peptides, and IL-2 (10-30 U/ml) was added on day 3. On day 8, responders were washed and restimulated in 2 ml with 2 X 10 6 autologous irradiated PBMC, fresh peptide, and IL-2, and spht as necessary until assay on day 14-16. For two HLA B*4501 -bearing persons including the index subject, convincing HLA class-restricted CD8 CTL were detected that not only lysed peptide-loaded targets, but also killed HSV-2-infected targets and were inhibited by anti-class I mAb (Table 10). Table 10. Lysis of HLA B*4501 LCL by PBMC stimulated with peptide HSV-2 ICPO 92-101, or (+) control clone RW.1997.51. Results are percent specific release in four-hour CTL assays at effector to target ratio of 10:1-20:1. target 1 effector RW RW RW RW HSV-2/ HV HV HV mock peptide 1 HSV-2 anti-class I 2 mock peptide HSV-2 RW PBMC 1 45.3 48.2 12.2 0 -1 0 PO PBMC 0 54.9 33.5 5.8 4 -1 0 clone 0 65.3 67.3 5.2 1 0 2 RW.1997.51 1 Target LCL (RW=B*4501, HV=not B*4501) loaded with 1 μg/ml ICPO 92-101 for 90 minutes, or HSV-2 infection, MOI 5,18 hours. 2 Anti-HLA class I mAb W6/32 included at 10 μg/ml. Example 11 : U;,47 stimulation of CTL responses in additional HLA-A2 subjects This example demonstrates that other HLA-A2 positive donors have detectable CD8+ T ceU responses to the previously defined UL47 peptide 550-559. The UL47 gene was amplified by PCR methods from genomic HSV-2 (strain 333) DNA and cloned into the pBIB retroviral vector. DNA was prepared from several U 47/PBIB clones and transfected into VA13 ceUs that stably express HLA-A2. These transfectants were recognized by the UL47/550-559-specific, HLA-A2-restricted CTL clone cpRW22 (Figure 19). Uι.47/550-559 peptide-pulsed VA13/A2 ceUs were used as a positive control. PBMC from several HLA-A2 positive donors (RW1874, HV5101, AD 116, AD 120 and AD124), some of whom were seropositive for HSV-2, were tested for the presence of U L 47-specific CD8+ T ceUs. The U L 47/550-559-specifιc, HLA-A*0201 -restricted CTL clone cpRW22 was previously derived from donor RW1874. The HSV-2 U L 47/289- 298(FLVDAIVRVA; SEQ ID NO: 20)-specific, A2-restricted clone HV2 was derived from donor HV5101. Thus, detection of U L 47-specific CD8+ T ceUs in the PBMC of RW1874 and HV5101 was expected. PBMC were stimulated twice in vitro with 1 μg/ml of one of three A2-restricted epitopes: influenza Ml/58-66, U L 47/289-298 or U L 47/550- 559. The T ceUs were then tested in a 51 Cr-release assay against targets pulsed with either no peptide, the stimulating peptide, or a control peptide (RT) derived from HIV. AU of the donors tested are known to be HIV negative. Results are shown in Figure 20A-L. RW1874 responded only to the Ml and UL47/550- 559 peptides (Figure 20A-C). HV5101 responded to aU three peptides (Figure 20D-F), even though UL47/289-298 is the only HSV-2 peptide that was identified using ceUs from this donor. AD120 did not respond to any of the three peptides (Figure 20G-I), suggesting that it may belong to a significantly distinct A2 subtype. AD 124 responded to the Ml, but not to either of the UL47 peptides (Figure 20J-L). This was expected because AD 124 is seronegative for HSV. These results are summarized in Table 11. Table 11. Summary of CD8+ T ceU responses to UL47 epitopes. Those skiUed in the art wiU appreciate that the conceptions and specific embodiments disclosed in the foregoing description may be readUy utihzed as a basis for modifying or designing other embodiments for carrying out the same purposes of the present invention. Those skiUed in the art wiU also appreciate that such equivalent embodiments do not depart from the spirit and scope of the invention as set forth in the appended claims.

Claims: What is claimed is: I . A pharmaceutical composition comprising a herpes simplex virus (HSV) polypeptide, wherein the polypeptide comprises an ICPO or U 47 protein or a fragment thereof, and a pharmaceuticaUy acceptable carrier. 2. The pharmaceutical composition of claim 1, wherein the fragment comprises amino acids 92-101 of ICPO or a substitutional variant thereof. 3. The pharmaceutical composition of claim 1, wherein the fragment comprises amino acids 289-298, 548-557, 550-559, 551-559 or 551-561 of U L 47 or a substitutional variant thereof. 4. The pharmaceutical composition of claim 1, wherein the polypeptide is a fusion protein. 5. The pharmaceutical composition of claim 4, wherein the fusion protein is soluble. 6. The pharmaceutical composition of claim 1, further comprising an adjuvant. 7. A polynucleotide that encodes amino acids 92-101 of ICPO, amino acids 289-298, 548-557, 550-559, 551-559 or 551-561 of U L 47, or a substitutional variant thereof. 8. A vector comprising the polynucleotide of claim 7. 9. A host ceU transformed with the vector of claim 8. 10. A method of producing an HSV polypeptide comprising culturing the host ceU of claim 9 and recovering the polypeptide so produced. I I . An HSV polypeptide produced by the method of claim 10. 12. A pharmaceutical composition comprising a polynucleotide that encodes ICPO or UL47 or a fragment thereof, and a pharmaceuticaUy acceptable carrier. 13. A pharmaceutical composition comprising the polynucleotide of claim 6 and a pharmaceuticaUy acceptable carrier. 14. A recombinant virus geneticaUy modified to express amino acids 92-101 of ICPO, amino acids 289-298, 548-557, 550-559, 551-559 or 551-561 of U L 47 or a substitutional variant thereof. 15. The recombinant virus of claim 14 which is a vaccinia virus, canary pox virus or adenovirus. 16. A pharmaceutical composition comprising the virus of claim 14 and a pharmaceuticaUy acceptable carrier. 17. The pharmaceutical composition of claim 12, 13 or 16, further comprising an adjuvant. 18. A method of producing immune ceUs directed against HSV comprising contacting an immune ceU with an antigen-presenting ceU, wherein the antigen- presenting ceU is modified to present an epitope included in an ICPO or U 47 protein or a substitutional variant thereof. 19. The method of claim 18, wherein the epitope comprises amino acids 92-101 of ICPO, or amino acids 289-298, 548-557, 550-559, 551-559 or 551-561 of U L 47. 20. The method of claim 18, wherein the immune ceU is a T ceU. 21. The method of claim 20, wherein the T ceU is a CD4+ or CD84- T ceU. 22. An immune ceU produced by the method of claim 18. 23. A method of killing an HSV infected ceU comprising contacting an HSV infected ceU with the immune ceU of claim 22. 24. A method of inhibiting HSV repUcation comprising contacting a heφes simplex virus with the immune ceU of claim 22. 25. A method of enhancing secretion of antiviral or immunomodulatory lymphokines comprising contacting an HSV infected ceU with the immune ceU of claim 22. 26. A method of enhancing production of HSV-specific antibody comprising contacting an HSV infected ceU in a subject with the immune ceU of claim 22. 27. A method of treating or preventing an HSV infection in a subject comprising administering the composition of claim 1 to the subject. 28. A method of treating or preventing an HSV infection in a subject comprising administering the immune ceU of claim 22 to the subject. 29. A method of treating or preventing an HSV infection in a subject comprising administering an antigen-presenting ceU modified to present an epitope included in an ICPO or UL47 protein to the subject. 30. The method of claim 29, wherein the epitope comprises amino acids 92-101 of ICPO, or amino acids 289-298, 548-557, 550-559, 551-559 or 551-561 of U L 47. 31. The method of claim 29, wherein the antigen-presenting ceU is modified with a virus, peptide or microsphere capable of mediating expression of the epitope. 32. A method for identifying HSV epitopes imrnunogenic for CD8+ T ceUs comprising: (a) obtaining CD8+ T ceUs from an HSV lesion; (b) assaying the obtained T ceUs to identify T ceUs having abihty to recognize HSV-infected ceUs; (c) obtaining and fragmenting a nucleic acid preparation from HSV; (d) expressing one or more fragments of the obtained nucleic acid; and (e) assaying the expressed fragments for antigenic reactivity with the HSV- specific T ceUs identified by the assaying of step (b), whereby an expressed fragment having reactivity with the HSV-specific T ceUs is identified as encoding an HSV epitope imrnunogenic for CD8+ T ceUs. 33. The method of claim 32, wherein the expressing comprises ligating the one or more fragments into one or more vectors using a partial fiU-in reaction to restrict ligation of a single fragment to each of the one or more vectors. 34. The method of claim 33, wherein the vector further comprises a nucleic acid encoding a heavy chain of an HLA molecule recognized by the HSV-specific T ceU. 35. The method of claim 32, wherein the assaying of step (e) comprises a lymphokine secretion assay. 36. The method of claim 35, wherein the lymphokine is interferon-gamma. 37. The method of claim 32, further comprising sequencing the fragment identified by the assaying of step (e). 38. The method of claim 32, wherein the HSV is HSV-2. 39. The method of claim 32, wherein the fragmenting comprises digestion with a restriction enzyme. 40. The method of claim 39, wherein the restriction enzyme is Sau3A I.

Inventors: CHEN HONGBO, COREY LAWRENCE, FLING STEVEN P, HOSKEN NANCY ANN, KOELLE DAVID M, MCGOWAN PATRICK, POSAVAD CHRISTINE M, CHEN, HONGBO, COREY, LAWRENCE, FLING, STEVEN, P., HOSKEN, NANCY, ANN, KOELLE, DAVID, M., MCGOWAN, PATRICK, POSAVAD, CHRISTINE, M.
Applicants: CORIXA CORP, HUTCHINSON FRED CANCER RES, UNIV WASHINGTON, CORIXA CORPORATION, FRED HUTCHINSON CANCER RESEARCH CENTER, UNIVERSITY OF WASHINGTON
Application year: 2000
Main classification: C07K7
IPC codes: A61K35, A61K39, A61P31, C07K14, C12N1, C12N5, C12N7, C12N15, C12P21, G01N33