COLD-ADAPTED EQUINE INFLUENZA VIRUSES

Abstract: The present invention provides experimentally-generated cold-adapted equine influenza viruses, and reassortant influenza A viruses comprising at least one genome segment of such an equine influenza virus, wherein the equine influenza virus genome segment confers at least one identifying phenotype of the cold-adapted equine influenza virus, such as cold-adaptation, temperature sensitivity, dominant interference, or attenuation. Such viruses are formulated into therapeutic compositions to protect animals from diseases caused by influenza A viruses, and in particular, to protect horses from disease caused by equine influenza virus. The present invention also includes methods to protect animals from diseases caused by influenza A virus or other infectious agents utilizing the claimed therapeutic compositions. Such methods include using a therapeutic composition as a vaccine to generate a protective immune response in an animal prior to exposure to an infectious agent, as well as using a therapeutic composition as a treatment for an animal that has been recently infected with an infectious agent leading to respiratory disease, or is likely to be subsequently exposed to such an agent in a few days whereby the therapeutic composition reduces such respiratory disease, even in the absence of antibody-mediated immunity. The present invention also provides methods to produce cold-adapted equine influenza viruses, and reassortant influenza A viruses having at least one genome segment of an equine influenza virus generated by cold-adaptation.

Description: COLD-ADAPTED EQUINE INFLUENZA VIRUSES FIELD OF THE INVENTION The present invention relates to experimentally-generated cold-adapted equine influenza viruses, and particularly to cold-adapted equine influenza viruses having additional phenotypes, such as attenuation, dominant interference, or temperature sensitivity. The invention also includes reassortant influenza A viruses which contain at least one genome segment from such an equine influenza virus, such that the reassortant virus includes certain phenotypes of the donor equine influenza virus. The invention further includes genetically-engineered equine influenza viruses, produced through reverse genetics, which comprise certain identifying phenotypes of a cold-adapted equine influenza virus of the present invention. The present invention also relates to the use of these viruses in therapeutic compositions to protect animals from diseases caused by influenza viruses. BACKGROUND OF THE INVENTION Equine influenza virus has been recognized as a major respiratory pathogen in horses since about 1956. Disease symptoms caused by equine influenza virus can be severe, and are often followed by secondary bacterial infections. Two subtypes of equine influenza virus are recognized, namely subtype- 1, the prototype being A/Equine/Prague/ 1/56 (H7N7), and subtype-2, the prototype being A/Equine/Miami/1/63 (H3N8). Presently, the predominant virus subtype is subtype-2, which has further diverged among Eurasian and North American isolates in recent years. The currently licensed vaccine for equine influenza is an inactivated (killed) virus vaccine. This vaccine provides minimal, if any, protection for horses, and can produce undesirable side effects, for example, inflammatory reactions at the site of injection. See, e.g., Mumford, 1987, Equine Infectious Disease IV, 207-217, and Mumford, et al., 1993, Vaccine 11, 1172-1174. Furthermore, current modalities cannot be used in young foals, because they cannot overcome maternal immunity, and can induce tolerance in a younger animal. Based on the severity of disease, there remains a need for safe, effective therapeutic compositions to protect horses against equine influenza disease. Production of therapeutic compositions comprising cold-adapted human influenza viruses is described, for example, in Maassab, et al., 1960, Nature 7,612-614, and Maassab, et al., 1969, /. Immunol. 102, 728-732. Furthermore, these researchers noted that cold-adapted human influenza viruses, i.e., viruses that have been adapted to grow at lower than normal temperatures, tend to have a phenotype wherein the virus is temperature sensitive; that is, the virus does not grow well at certain higher, non- permissive temperatures at which the wild-type virus will grow and replicate. Various cold-adapted human influenza A viruses, produced by reassortment with existing cold- adapted human influenza A viruses, have been shown to elicit good immune responses in vaccinated individuals, and certain live attenuated cold-adapted reassortant human influenza A viruses have proven to protect humans against challenge with wild-type virus. See, e.g., Clements, et al., 1986, J. Clin. Microbiol. 23, 73-76. In U.S. Patent No. 5,149,531, by Youngner, et al., issued September 22, 1992, the inventors of the present invention further demonstrated that certain reassortant cold-adapted human influenza A viruses also possess a dominant interference phenotype, i.e., they inhibit the growth of their corresponding parental wild-type strain, as well as heterologous influenza A viruses. U.S. Patent No. 4,683,137, by Coggins et al, issued July 28, 1987, and U.S. Patent No. 4,693,893, by Campbell, issued September 15, 1987, disclose attenuated therapeutic compositions produced by reassortment of wild-type equine influenza viruses with attenuated, cold-adapted human influenza A viruses. Although these therapeutic compositions appear to be generally safe and effective in horses, they pose a significant danger of introducing into the environment a virus containing both human and equine influenza genes. SUMMARY OF THE INVENTION The present invention provides experimentally-generated cold-adapted equine influenza viruses, reassortant influenza A viruses that comprise at least one genome segment of an equine influenza virus generated by cold-adaptation such that the equine influenza virus genome segment confers at least one identifying phenotype of a cold- adapted equine influenza virus on the reassortant virus, and genetically-engineered equine influenza viruses, produced through reverse genetics, which comprise at least one identifying phenotype of a cold-adapted equine influenza virus. Identifying phenotypes include cold-adaptation, temperature sensitivity, dominant interference, and attenuation. The invention further provides a therapeutic composition to protect an animal against disease caused by an influenza A virus, where the therapeutic composition includes a cold-adapted equine influenza virus a reassortant influenza A virus, or a genetically- engineered equine influenza virus of the present invention. Also provided is a method to protect an animal from diseases caused by an influenza A virus which includes the administration of such a therapeutic composition. Also provided are methods to produce a cold-adapted equine influenza virus, and methods to produce a reassortant influenza A virus which comprises at least one genome segment of a cold-adapted equine influenza virus, where the equine influenza genome segment confers on the reassortant virus at least one identifying phenotype of the cold-adapted equine influenza virus. A cold-adapted equine influenza virus is one that replicates in embryonated chicken eggs at a temperature ranging from about 26°C to about 30°C. Preferably, a cold-adapted equine influenza virus, reassortant influenza A vims, or genetically- engineered equine influenza virus of the present invention is attenuated, such that it will not cause disease in a healthy animal. In one embodiment, a cold-adapted equine influenza virus, reassortant influenza A virus, or genetically-engineered equine influenza virus of the present invention is also temperature sensitive, such that the virus replicates in embryonated chicken eggs at a temperature ranging from about 26°C to about 30°C, forms plaques in tissue culture cells at a permissive temperature of about 34°C, but does not form plaques in tissue culture cells at a non-permissive temperature of about 39°C. In one embodiment, such a temperature sensitive virus comprises two mutations: a first mutation that inhibits plaque formation at a temperature of about 39°C, that mutation co-segregating with the genome segment that encodes the viral nucleoprotein gene; and a second mutation that inhibits all viral protein synthesis at a temperature of about 39°C. In another embodiment, a cold-adapted, temperature sensitive equine influenza virus of the present invention replicates in embryonated chicken eggs at a temperature ranging from about 26°C to about 30°C, forms plaques in tissue culture cells at a permissive temperature of about 34°C, but does not form plaques in tissue culture cells or express late viral proteins at a non-permissive temperature of about 37°C. Typically, a cold-adapted equine influenza virus of the present invention is produced by passaging a wild-type equine influenza virus one or more times, and then selecting viruses that stably grow and replicate at a reduced temperature. A cold-adapted equine influenza virus produced thereby includes, in certain embodiments, a dominant interference phenotype, that is, the virus, when co-infected with a parental equine influenza virus or heterologous wild-type influenza A virus, will inhibit the growth of that virus. Examples of cold-adapted equine influenza viruses of the present invention include EIV-P821, identified by accession No. ATCC VR 2625; EIV-P824, identified by accession No. ATCC VR 2624; EIV-MSV+5, identified by accession No. ATCC VR 2627; and progeny of such viruses. Therapeutic compositions of the present invention include from about 10 5 TCID 50 units to about 10 s TCID 50 units, and preferably about 2 x 10 6 TCID 50 units, of a cold- adapted equine influenza virus, reassortant influenza A virus, or genetically-engineered equine influenza virus of the present invention. The present invention also includes a method to protect an animal from disease caused by an influenza A virus, which includes the step of administering to the animal a therapeutic composition including a cold-adapted equine influenza virus, a reassortant influenza A virus, or a genetically-engineered equine influenza virus of the present invention. Also provided is a method to treat animals for respiratory disease which includes the administration of a therapeutic composition of the present invention. While not being bound by theory, it is believed that administration of a therapeutic composition of the present invention exhibits non-specific interference of respiratory disease in animals infected with equine influenza virus or other infectious agents. Examples of such infectious agents include, but are not limited to, any virus or bacterium that leads to respiratory disease, either directly or indirectly. The present invention provides a method to treat animals that exhibit respiratory disease by administration of a therapeutic composition including a cold-adapted equine influenza virus, a reassortant influenza A virus, or a genetically-engineered equine influenza virus of the present invention. The present invention further provides a method to reduce nasal discharge in young animals, such as that apparently caused by viral and/or bacterial infections, by administration of a therapeutic composition including a cold-adapted equine influenza virus, a reassortant influenza A virus, or a genetically-engineered equine influenza virus of the present invention. Preferred animals to protect include equids, with horses and ponies being particularly preferred. Yet another embodiment of the present invention is a method to generate a cold- adapted equine influenza virus. The method includes the steps of passaging a wild-type equine influenza virus; and selecting viruses that grow at a reduced temperature. In one embodiment, the method includes repeating the passaging and selection steps one or more times, while progressively reducing the temperature. Passaging of equine influenza virus preferably takes place in embryonated chicken eggs. Another embodiment is an method to produce a reassortant influenza A virus through genetic reassortment of the genome segments of a donor cold-adapted equine influenza virus of the present invention with the genome segments of a recipient influenza A virus. Reassortant influenza A viruses of the present invention are produced by a method that includes the steps of: (a) mixing the genome segments of a donor cold- adapted equine influenza virus with the genome segments of a recipient influenza A virus, and (b) selecting viruses which include at least one identifying phenotype of the donor equine influenza virus. Identifying phenotypes include cold-adaptation, temperature sensitivity, dominant interference, and attenuation. Preferably, such reassortant viruses at least include the attenuation phenotype of the donor virus. A typical reassortant virus will have the antigenicity of the recipient virus, that is, it will retain the hemagglutinin (HA) and neuraminidase (NA) phenotypes of the recipient virus. The present invention provides methods to propagate cold-adapted equine influenza viruses or reassortant influenza A viruses of the present invention. These methods include propagation in embryonated chicken eggs or in tissue culture cells. DETAILED DESCRIPTION OF THE INVENTION The present invention provides experimentally-generated cold-adapted equine influenza viruses comprising certain defined phenotypes, which are disclosed herein. It is to be noted that the term "a" or "an" entity, refers to one or more of that entity; for example, "a cold-adapted equine influenza virus" can include one or more cold-adapted equine influenza viruses. As such, the terms "a" (or "an"), "one or more," and "at least one" can be used interchangeably herein. It is also to be noted that the terms "comprising," "including," and "having" can be used interchangeably. Furthermore, an item "selected from the group consisting of refers to one or more of the items in that group, including combinations thereof. A cold-adapted equine influenza virus of the present invention is a virus that has been generated in the laboratory, and as such, is not a virus as occurs in nature. Since the present invention also includes those viruses having the identifying phenotypes of such a cold-adapted equine influenza virus, an equine influenza virus isolated from a mixture of naturally-occurring viruses, i.e., removed from its natural milieu, but having the claimed phenotypes, is included in the present invention. A cold-adapted equine influenza virus of the present invention does not require any specific level of purity. For example, a cold-adapted equine influenza virus grown in embryonated chicken eggs may be in a mixture with the allantoic fluid (AF), and a cold-adapted equine influenza virus grown in tissue culture cells may be in a mixture with disrupted cells and tissue culture medium. As used herein, an "equine influenza virus" is an influenza virus that infects and grows in equids, e.g., horses or ponies. As used herein, "growth" of a virus denotes the ability of the virus to reproduce or "replicate" itself in a permissive host cell. As such, the terms, "growth of a virus" and "replication of a virus" are used interchangeably herein. Growth or replication of a virus in a particular host cell can be demonstrated and measured by standard methods well-known to those skilled in the art of virology. For example, samples containing infectious virus, e.g., as contained in nasopharyngeal secretions from an infected horse, are tested for their ability to cause cytopathic effect (CPE), e.g., virus plaques, in tissue culture cells. Infectious virus may also be detected by inoculation of a sample into the allantoic cavity of embryonated chicken eggs, and then testing the AF of eggs thus inoculated for its ability to agglutinate red blood cells, i.e., cause hemagglutination, due to the presence of the influenza virus hemagglutinin (HA) protein in the AF. Naturally-occurring, i.e., wild-type, equine influenza viruses replicate well at a temperature from about 34°C to about 39°C. For example, wild-type equine influenza virus replicates in embryonated chicken eggs at a temperature of about 34°C, and replicates in tissue culture cells at a temperature from about 34°C to about 39°C. As used herein, a "cold-adapted" equine influenza virus is an equine influenza virus that has been adapted to grow at a temperature lower than the optimal growth temperature for equine influenza virus. One example of a cold-adapted equine influenza virus of the present invention is a virus that replicates in embryonated chicken eggs at a temperature of about 30°C. A preferred cold-adapted equine influenza virus of the present invention replicates in embryonated chicken eggs at a temperature of about 28°C. Another preferred cold-adapted equine influenza virus of the present invention replicates in embryonated chicken eggs at a temperature of about 26°C. In general, preferred cold- adapted equine influenza viruses of the present invention replicate in embryonated chicken eggs at a temperature ranging from about 26°C to about 30°C, i.e., at a range of temperatures at which a wild-type virus will grow poorly or not at all. It should be noted that the ability of such viruses to replicate within that temperature range does not preclude their ability to also replicate at higher or lower temperatures. For example, one embodiment is a cold-adapted equine influenza virus that replicates in embryonated chicken eggs at a temperature of about 26°C, but also replicates in tissue culture cells at a temperature of about 34°C. As with wild-type equine influenza viruses, cold-adapted equine influenza viruses of the present invention generally form plaques in tissue culture cells, for example Madin Darby Canine Kidney Cells (MDCK) at a temperature of about 34°C. Examples of suitable and preferred cold-adapted equine influenza viruses of the present invention are disclosed herein. One embodiment of the present invention is a cold-adapted equine influenza virus that is produced by a method which includes passaging a wild-type equine influenza virus, and then selecting viruses that grow at a reduced temperature. Cold- adapted equine influenza viruses of the present invention can be produced, for example, by sequentially passaging a wild-type equine influenza virus in embryonated chicken eggs at progressively lower temperatures, thereby selecting for certain members of the virus mixture which stably replicate at the reduced temperature. An example of a passaging procedure is disclosed in detail in the Examples section. During the passaging procedure, one or more mutations appear in certain of the single-stranded RNA segments comprising the influenza virus genome, which alter the genotype, i.e., the primary nucleotide sequence of those RNA segments. As used herein, a "mutation" is an alteration of the primary nucleotide sequence of any given RNA segment making up an influenza virus genome. Examples of mutations include substitution of one or more nucleotides, deletion of one or more nucleotides, insertion of one or more nucleotides, or inversion of a stretch of two or more nucleotides. By selecting for those members of the virus mixture that stably replicate at a reduced temperature, a virus with a cold- adaptation phenotype is selected. As used herein, a "phenotype" is an observable or measurable characteristic of a biological entity such as a cell or a virus, where the observed characteristic is attributable to a specific genetic configuration of that biological entity, i.e., a certain genotype. As such, a cold-adaptation phenotype is the result of one or more mutations in the virus genome. As used herein, the terms "a mutation," "a genome," "a genotype," or "a phenotype"refer to one or more, or at least one mutation, genome, genotype, or phenotype, respectively. Additional, observable phenotypes in a cold-adapted equine influenza virus may occur, and will generally be the result of one or more additional mutations in the genome of such a virus. For example, a cold-adapted equine influenza virus of the present invention may, in addition, be attenuated, exhibit dominant interference, and/or be temperature sensitive. In one embodiment, a cold-adapted equine influenza virus of the present invention has a phenotype characterized by attenuation. A cold-adapted equine influenza virus is "attenuated," when administration of the virus to an equine influenza virus-susceptible animal results in reduced or absent clinical signs in that animal, compared to clinical signs observed in animals that are infected with wild-type equine influenza virus. For example, an animal infected with wild-type equine influenza virus will display fever, sneezing, coughing, depression, and nasal discharges. In contrast, an animal administered an attenuated, cold-adapted equine influenza virus of the present invention will display minimal or no, i.e., undetectable, clinical disease signs. In another embodiment, a cold-adapted equine influenza virus of the present invention comprises a temperature sensitive phenotype. As used herein, a temperature sensitive cold-adapted equine influenza virus replicates at reduced temperatures, but no longer replicates or forms plaques in tissue culture cells at certain higher growth temperatures at which the wild-type virus will replicate and form plaques. While not being bound by theory, it is believed that replication of equine influenza viruses with a temperature sensitive phenotype is largely restricted to the cool passages of the upper respiratory tract, and does not replicate efficiently in the lower respiratory tract, where the virus is more prone to cause disease symptoms. A temperature at which a temperature sensitive virus will grow is referred to herein as a "permissive" temperature for that temperature sensitive virus, and a higher temperature at which the temperature sensitive virus will not grow, but at which a corresponding wild-type virus will grow, is referred to herein as a "non-permissive" temperature for that temperature sensitive virus. For example, certain temperature sensitive cold-adapted equine influenza viruses of the present invention replicate in embryonated chicken eggs at a temperature at or below about 30°C, preferably at about 28°C or about 26°C, and will form plaques in tissue culture cells at a permissive temperature of about 34°C, but will not form plaques in tissue culture cells at a non-permissive temperature of about 39°C. Other temperature sensitive cold-adapted equine influenza viruses of the present invention replicate in embryonated chicken eggs at a temperature at or below about 30°C, preferably at about 28°C or about 26°C, and will form plaques in tissue culture cells at a permissive temperature of about 34°C, but will not form plaques in tissue culture cells at a non- permissive temperature of about 37°C. Certain cold-adapted equine influenza viruses of the present invention have a dominant interference phenotype; that is, they dominate an infection when co-infected into cells with another influenza A virus, thereby impairing the growth of that other virus. For example, when a cold-adapted equine influenza virus of the present invention, having a dominant interference phenotype, is co-infected into MDCK cells with the wild-type parental equine influenza virus, A/equine/Kentucky/ 1/91 (H3N8), growth of -lOthe parental virus is impaired. Thus, in an animal that has recently been exposed to, or may be soon exposed to, a virulent influenza virus, i.e., an influenza virus that causes disease symptoms, administration of a therapeutic composition comprising a cold- adapted equine influenza virus having a dominant interference phenotype into the upper respiratory tract of that animal will impair the growth of the virulent virus, thereby ameliorating or reducing disease in that animal, even in the absence of an immune response to the virulent virus. Dominant interference of a cold-adapted equine influenza virus having a temperature sensitive phenotype can be measured by standard virological methods. For example, separate monolayers of MDCK cells can be infected with (a) a virulent wild- type influenza A virus, (b) a temperature sensitive, cold-adapted equine influenza virus, and (c) both viruses in a co-infection, with all infections done at multiplicities of infection (MOI) of about 2 plaque forming units (pfu) per cell. After infection, the virus yields from the various infected cells are measured by duplicate plaque assays performed at the permissive temperature for the cold-adapted equine influenza virus and at the non- permissive temperature of that virus. A cold adapted equine influenza virus having a temperature sensitive phenotype is unable to form plaques at its non-permissive temperature, while the wild-type virus is able to form plaques at both the permissive and non-permissive temperatures. Thus it is possible to measure the growth of the wild-type virus in the presence of the cold adapted virus by comparing the virus yield at the non- permissive temperature of the cells singly infected with wild-type virus to the yield at the non-permissive temperature of the wild-type virus in doubly infected cells. Cold-adapted equine influenza viruses of the present invention are characterized primarily by one or more of the following identifying phenotypes: cold-adaptation, temperature sensitivity, dominant interference, and/or attenuation. As used herein, the phrase "an equine influenza virus comprises the identifying phenotype(s) of cold- adaptation, temperature sensitivity, dominant interference, and/or attenuation" refers to a virus having such a phenotype(s). Examples of such viruses include, but are not limited to, EIV-P821, identified by accession No. ATCC VR 2625, EIV-P824, identified by accession No. ATCC NR 2624, and EIN-MSN+5, identified by accession No. ATCC VR 2627, as well as EIN-MSVO, EIV, MSV+1, EIV-MSV+2, EIV-MSV+3, and EIV- MS V+4. Production of such viruses is described in the examples. For example, cold- adapted equine influenza virus EIV-P821 is characterized by, i.e., has the identifying phenotypes of, (a) cold-adaptation, e.g., its ability to replicate in embryonated chicken eggs at a temperature of about 26°C; (b) temperature sensitivity, e.g., its inability to form plaques in tissue culture cells and to express late gene products at a non-permissive temperature of about 37°C, and its inability to form plaques in tissue culture cells and to synthesize any viral proteins at a non-permissive temperature of about 39°C; (c) its attenuation upon administration to an equine influenza virus-susceptible animal; and (d) dominant interference, e.g., its ability, when co-infected into a cell with a wild-type influenza A virus, to interfere with the growth of that wild-type virus. Similarly, cold- adapted equine influenza virus EIV-P824 is characterized by (a) cold adaptation, e.g., its ability to replicate in embryonated chicken eggs at a temperature of about 28 °C; (b) temperature sensitivity, e.g., its inability to form plaques in tissue culture cells at a non-permissive temperature of about 39°C; and (c) dominant interference, e.g., its ability, when co-infected into a cell with a wild- type influenza A viras, to interfere with the growth of that wild-type virus. In another example, cold-adapted equine influenza virus EIV-MS V+5 is characterized by (a) cold-adaptation, e.g., its ability to replicate in embryonated chicken eggs at a temperature of about 26°C; (b) temperature sensitivity, e.g., its inability to form plaques in tissue culture cells at a non-permissive temperature of about 39°C; and (c) its attenuation upon administration to an equine influenza virus- susceptible animal. In certain cases, the RNA segment upon which one or more mutations associated with a certain phenotype occur may be determined through reassortment analysis by standard methods, as disclosed herein. In one embodiment, a cold-adapted equine influenza virus of the present invention comprises a temperature sensitive phenotype that correlates with at least two mutations in the genome of that virus. In this embodiment, one of the two mutations, localized by reassortment analysis as disclosed herein, inhibits, i.e., blocks or prevents, the ability of the virus to form plaques in tissue culture cells at a non-permissive temperature of about 39°C. This mutation co-segregates with the segment of the equine influenza virus genome that encodes the nucleoprotein (NP) gene of the virus, i.e., the mutation is located on the same RNA segment as the NP gene. In this embodiment, the second mutation inhibits all protein synthesis at a non-permissive temperature of about 39°C. As such, at the non-permissive temperature, the virus genome is incapable of expressing any viral proteins. Examples of cold-adapted equine influenza viruses possessing these characteristics are EIV-P821 and EIV MSV+5. EIV- P821 was generated by serial passaging of a wild-type equine influenza virus in embryonated chicken eggs by methods described in Example 1 A. EIV-MSV+5 was derived by further serial passaging of EIV-P821, as described in Example IE. Furthermore, a cold-adapted, temperature sensitive equine influenza virus comprising the two mutations which inhibit plaque formation and viral protein synthesis at a non-permissive temperature of about 39°C can comprise one or more additional mutations, which inhibit the virus' ability to synthesize late gene products and to form plaques in tissue culture cells at a non-permissive temperature of about 37°C. An example of a cold-adapted equine influenza virus possessing these characteristics is EIV- P821. This virus isolate replicates in embryonated chicken eggs at a temperature of about 26°C, and does not form plaques or express any viral proteins at a temperature of about 39°C. Furthermore, EIV-P821 does not form plaques on MDCK cells at a non- permissive temperature of about 37°C, and at this temperature, late gene expression is inhibited in such a way that late proteins are not produced, i.e., normal levels of NP protein are synthesized, reduced or undetectable levels of Ml or HA proteins are synthesized, and enhanced levels of the polymerase proteins are synthesized. Since this phenotype is typified by differential viral protein synthesis, it is distinct from the protein synthesis phenotype seen at a non-permissive temperature of about 39°C, which is typified by the inhibition of synthesis of all viral proteins. Pursuant to 37 CFR § 1.802 (a-c), cold-adapted equine influenza viruses, designated herein as EIV-P821, an EIV-P824 were deposited with the American Type Culture Collection (ATCC, 10801 University Boulevard, Manassas, VA 20110-2209) under the Budapest Treaty as ATCC Accession Nos. ATCC VR-2625, and ATCC VR- 2624, respectively, on July 11, 1998. Cold-adapted equine influenza virus EIV-MSV+5 was deposited with the ATCC as ATCC Accession No. ATCC VR-2627 on August 3, 1998. Pursuant to 37 CFR§ 1.806, the deposits are made for a term of at least thirty (30) years and at least five (5) years after the most recent request for the furnishing of a sa ple of the deposit was received by the depository. Pursuant to 37 CFR § 1.808 (a)(2), all restrictions imposed by the depositor on the availability to the public will be irrevocably removed upon the granting of the patent. Preferred cold-adapted equine influenza viruses of the present invention have the identifying phenotypes of EIV-P821 , EIV-P824, and EIV-MSV+5. Particularly preferred cold-adapted equine influenza viruses include EIV-P821, ETV-P824, EIV- MSV+5, and progeny of these viruses. As used herein, "progeny" are "offspring," and as such can slightly altered phenotypes compared to the parent virus, but retain identifying phenotypes of the parent virus, for example, cold-adaptation, temperature sensitivity, dominant interference, or attenuation. For example, cold-adapted equine influenza virus EIV-MSV+5 is a "progeny" of cold-adapted equine influenza virus EIV- P821. "Progeny" also include reassortant influenza A viruses that comprise one or more identifying phenotypes of the donor parent virus. Reassortant influenza A viruses of the present invention are produced by genetic reassortment of the genome segments of a donor cold-adapted equine influenza virus of the present invention with the genome segments of a recipient influenza A virus, and then selecting a reassortant virus that derives at least one of its eight RNA genome segments from the donor virus, such that the reassortant virus acquires at least one identifying phenotype of the donor cold-adapted equine influenza virus. Identifying phenotypes include cold-adaptation, temperature sensitivity, attenuation, and dominant interference. Preferably, reassortant influenza A viruses of the present invention derive at least the attenuation phenotype of the donor virus. Methods to isolate reassortant influenza viruses are well known to those skilled in the art of virology and are disclosed, for example, in Fields, et al., 1996, Fields Virology, 3d ed., Lippincott-Raven; and Palese, et al., 1976, . Virol., 17, 876-884. Fields, et al., ibid, and Palese, et al., ibid, are incorporated herein by reference in their entireties. A suitable donor equine influenza virus is a cold-adapted equine influenza virus of the present invention, for example, EIV-P821, identified by accession No. ATCC VR2625, ETV-P824, identified by accession No. ATCC VR2624, or EIV-MSV+5, identified by accession No. ATCC VR2627. A suitable recipient influenza A virus can be another equine influenza virus, for example a Eurasian subtype 2 equine influenza virus such as A equine/Suffolk 89 (H3N8) or a subtype 1 equine influenza virus such as A/Prague/1/56 (H7N7). A recipient influenza A virus can also be any influenza A virus capable of forming a reassortant virus with a donor cold-adapted equine influenza virus. Examples of such influenza A viruses include, but are not limited to, human influenza viruses such as A/Puerto Rico/8/34 (H1N1), A Hong Kong/156/97 (H5N1), A/Singapore/1/57 (H2N2), and A/Hong Kong/1/68 (H3N2); swine viruses such as A/Swine/Iowa 15/30 (H1N1); and avian viruses such as A/mallard/New York/6750/78 (H2N2) and A/chicken/Hong Kong/258/97 (H5N1). A reassortant virus of the present invention can include any combination of donor and recipient gene segments, as long as the resulting reassortant virus possesses at least one identifying phenotype of the donor virus. One example of a reassortant virus of the present invention is a "6 + 2" reassortant virus, in which the six "internal gene segments," i.e., those comprising the NP, PB2, PB1, PA, M, and NS genes, are derived from the donor cold-adapted equine influenza virus genome, and the two "external gene segments," i.e., those comprising the HA and NA genes, are derived from the recipient influenza A virus. A resultant virus thus produced has the attenuated, cold-adapted, temperature sensitive, and/or dominant interference phenotypes of the donor cold-adapted equine influenza virus, but the antigenicity of the recipient strain. In yet another embodiment, a cold-adapted equine influenza virus of the present invention can be produced through recombinant means. In this approach, one or more specific mutations, associated with identified cold-adaptation, attenuation, temperature sensitivity, or dominant interference phenotypes, are identified and are introduced back into a wild-type equine influenza virus strain using a reverse genetics approach. Reverse genetics entails using RNA polymerase complexes isolated from influenza virus-infected cells to transcribe artificial influenza viras genome segments containing the mutation(s), incorporating the synthesized RNA segment(s) into viras particles using a helper viras, and then selecting for viruses containing the desired changes. Reverse genetics methods for influenza viruses are described, for example, in Enami, et al., 1990, Proc. Nail. Acad. Sci. 87, 3802-3805; and in U.S. Patent No. 5,578,473, by Palese, et al., issued November 26, 1996, both of which are incorporated herein by reference in their entireties. This approach allows one skilled in the art to produce additional cold-adapted equine influenza viruses of the present invention without the need to go through the lengthy cold-adaptation process, and the process of selecting mutants both in vitro and in vivo with the desired virus phenotype. A cold-adapted equine influenza virus of the present invention may be propagated by standard virological methods well-known to those skilled in the art, examples of which are disclosed herein. For example, a cold-adapted equine influenza viras can be grown in embryonated chicken eggs or in eukaryotic tissue culture cells. Suitable continuous eukaryotic cell lines upon which to grow a cold-adapted equine influenza viras of the present invention include those that support growth of influenza viruses, for example, MDCK cells. Other suitable cells upon which to grow a cold- adapted equine influenza viras of the present invention include, but are not limited to, primary kidney cell cultures of monkey, calf, hamster or chicken. In one embodiment, the present invention provides a therapeutic composition to protect an animal against disease caused by an influenza A viras, where the therapeutic composition includes either a cold-adapted equine influenza viras or a reassortant influenza A virus comprising at least one genome segment of an equine influenza viras generated by cold-adaptation, wherein the equine influenza viras genome segment confers at least one identifying phenotype of the cold-adapted equine influenza viras. hi addition, a therapeutic composition of the present invention can include an equine influenza viras that has been genetically engineered to comprise one or more mutations, where those mutations have been identified to confer a certain identifying phenotype on a cold-adapted equine influenza virus of the present invention. As used herein, the phrase "disease caused by an influenza A viras" refers to the clinical manifestations observed in an animal which has been infected with a virulent influenza A virus. Examples of such clinical manifestations include, but are not limited to, fever, sneezing, coughing, nasal discharge, rales, anorexia and depression. In addition, the phrase "disease caused by an influenza A viras" is defined herein to include shedding of viralent viras by the infected animal. Verification that clinical manifestations observed in an animal correlate with infection by viralent equine influenza viras may be made by several methods, including the detection of a specific antibody and/or T-cell responses to equine influenza viras in the animal. Preferably, verification that clinical manifestations observed in an animal correlate with infection by a virulent influenza A virus is made by the isolation of the virus from the afflicted animal, for example, by swabbing the nasopharyngeal cavity of that animal for virus-containing secretions. Verification of virus isolation may be made by the detection of CPE in tissue culture cells inoculated with the isolated secretions, by inoculation of the isolated secretions into embryonated chicken eggs, where virus replication is detected by the ability of AF from the inoculated eggs to agglutinate erythrocytes, suggesting the presence of the influenza virus hemagglutinin protein, or by use of a commercially available diagnostic test, for example, the Directigen® FLU A test. ' As used herein, the term "to protect" includes, for example, to prevent or to treat influenza A viras infection in the subject animal. As such, a therapeutic composition of the present invention can be used, for example, as a prophylactic vaccine to protect a subject animal from influenza disease by administering the therapeutic composition to that animal at some time prior to that animal's exposure to the viralent viras. A therapeutic composition of the present invention, comprising a cold-adapted equine influenza viras having a dominant interference phenotype, can also be used to treat an animal that has been recently infected with viralent influenza A virus or is likely to be subsequently exposed in a few days, such that the therapeutic composition immediately interferes with the growth of the viralent viras, prior to the animal's production of antibodies to the virulent viras. A therapeutic composition comprising a cold-adapted equine influenza virus having a dominant interference phenotype may be effectively administered prior to subsequent exposure for a length of time corresponding to the approximate length of time that a cold-adapted equine influenza virus of the present invention will replicate in the upper respiratory tract of a treated animal, for example, up to about seven days. A therapeutic composition comprising a cold-adapted equine influenza virus having a dominant interference phenotype may be effectively administered following exposure to virulent equine influenza viras for a length of time corresponding to the time required for an infected animal to show disease symptoms, for example, up to about two days. Therapeutic compositions of the present invention can be administered to any animal susceptible to influenza viras disease, for example, humans, swine, horses and other equids, aquatic birds, domestic and game fowl, seals, mink, and whales. Preferably, a therapeutic composition of the present invention is administered equids. Even more preferably, a therapeutic composition of the present invention is administered to a horse, to protect against equine influenza disease. Current vaccines available to protect horses against equine influenza virus disease are not effective in protecting young foals, most likely because they cannot overcome the maternal antibody present in these young animals, and often, vaccination at an early age, for example 3 months of age, can lead to tolerance rather than immunity. In one embodiment, and in contrast to existing equine influenza viras vaccines, a therapeutic composition comprising a cold-adapted equine influenza viras of the present invention apparently can produce immunity in young animals. As such, a therapeutic composition of the present invention can be safely and effectively administered to young foals, as young as about 3 months of age, to protect against equine influenza disease without the induction of tolerance. In one embodiment, a therapeutic composition of the present invention can be multivalent. For example, it can protect an animal from more than one strain of influenza A virus by providing a combination of one or more cold-adapted equine influenza viruses of the present invention, one or more reassortant influenza A viruses, and/or one or more genetically-engineered equine influenza viruses of the present invention. Multivalent therapeutic compositions can include at least two cold-adapted equine influenza viruses, e.g., against North American subtype-2 viras isolates such as A/equine/Kentucky/ 1/91 (H1N8), and Eurasian subtype-2 viras isolates such as A/equine/Suffolk/89 (H3N8); or one or more subtype-2 viras isolates and a subtype- 1 viras isolate such as A/equine/Prague/1/56 (H7N7). Similarly, a multivalent therapeutic composition of the present invention can include a cold-adapted equine influenza viras and a reassortant influenza A viras of the present invention, or two reassortant influenza A viruses of the present invention. A multivalent therapeutic composition of the present invention can also contain one or more formulations to protect against one or more other infectious agents in addition to influenza A virus. Such other infectious agents include, but not limited to: viruses; bacteria; fungi and fungal-related microorganisms; and parasites. Preferable multivalent therapeutic compositions include, but are not limited to, a cold-adapted equine influenza virus, reassortant influenza A viras, or genetically- engineered equine influenza viras of the present invention plus one or more compositions protective against one or more other infectious agents that afflict horses. Suitable infectious agents to protect against include, but are not limited to, equine infectious anemia virus, equine herpes viras, eastern, western, or Venezuelan equine encephalitis viras, tetanus, Streptococcus equi, and Ehrlichia resticii. A therapeutic composition of the present invention can be formulated in an excipient that the animal to be treated can tolerate. Examples of such excipients include water, saline, Ringer's solution, dextrose solution, Hank's solution, and other aqueous physiologically balanced salt solutions. Excipients can also contain minor amounts of additives, such as substances that enhance isotonicity and chemical or biological stability. Examples of buffers include phosphate buffer, bicarbonate buffer, and Tris buffer, while examples of stabilizers include A1/A2 stabilizer, available from Diamond Animal Health, Des Moines, IA. Standard formulations can either be liquids or solids which can be taken up in a suitable liquid as a suspension or solution for administration to an animal. In one embodiment, a non-liquid formulation may comprise the excipient salts, buffers, stabilizers, etc., to which sterile water or saline can be added prior to administration. A therapeutic composition of the present invention may also include one or more adjuvants or carriers. Adjuvants are typically substances that enhance the immune response of an animal to a specific antigen, and carriers include those compounds that increase the half-life of a therapeutic composition in the treated animal. One advantage of a therapeutic composition comprising a cold-adapted equine influenza viras or a reassortant influenza A viras of the present invention is that adjuvants and carriers are not required to produce an efficacious vaccine. Furthermore, in many cases known to those skilled in the art, the advantages of a therapeutic composition of the present invention would be hindered by the use of some adjuvants or carriers. However, it should be noted that use of adjuvants or carriers is not precluded by the present invention. Therapeutic compositions of the present invention include an amount of a cold- adapted equine influenza viras that is sufficient to protect an animal from challenge with viralent equine influenza virus. In one embodiment, a therapeutic composition of the present invention can include an amount of a cold-adapted equine influenza virus ranging from about 10 5 tissue culture infectious dose-50 (TCID 50 ) units of virus to about 10 8 TCID 50 units of viras. As used herein, a "TCID 50 unit" is amount of a virus which results in cytopathic effect in 50% of those cell cultures infected. Methods to measure and calculate TCID 50 are known to those skilled in the art and are available, for example, in Reed and Muench, 1938, Am. J. ofHyg. 27, 493-497, which is incorporated herein by reference in its entirety. A preferred therapeutic composition of the present invention comprises from about 10 6 TCTD 50 units to about 10 7 TCID 50 units of a cold-adapted equine influenza virus or reassortant influenza A virus of the present invention. Even more preferred is a therapeutic composition comprising about 2 x 10 6 TCID 50 units of a cold-adapted equine influenza virus or reassortant influenza A viras of the present invention. The present invention also includes methods to protect an animal against disease caused by an influenza A viras comprising administering to the animal a therapeutic composition of the present invention. Preferred are those methods which protect an equid against disease caused by equine influenza virus, where those methods comprise administering to the equid a cold-adapted equine influenza virus. Acceptable protocols to administer therapeutic compositions in an effective manner include individual dose size, number of doses, frequency of dose administration, and mode of administration. Determination of such protocols can be accomplished by those skilled in the art, and examples are disclosed herein. A preferable method to protect an animal against disease caused by an influenza A virus includes administering to that animal a single dose of a therapeutic composition comprising a cold-adapted equine influenza viras, a reassortant influenza A viras, or genetically-engineered equine influenza viras of the present invention. A suitable single dose is a dose that is capable of protecting an animal from disease when administered one or more times over a suitable time period. The method of the present invention may also include administering subsequent, or booster doses of a therapeutic composition. Booster administrations can be given from about 2 weeks to several years after the original administration. Booster administrations preferably are administered when the immune response of the animal becomes insufficient to protect the animal from disease. Examples of suitable and preferred dosage schedules are disclosed in the Examples section. A therapeutic composition of the present invention can be administered to an animal by a variety of means, such that the viras will enter and replicate in the mucosal cells in the upper respiratory tract of the treated animal. Such means include, but are not limited to, intranasal administration, oral administration, and intraocular administration. Since influenza viruses naturally infect the mucosa of the upper respiratory tract, a preferred method to administer a therapeutic composition of the present invention is by intranasal administration. Such administration may be accomplished by use of a syringe fitted with cannula, or by use of a nebulizer fitted over the nose and mouth of the animal to be vaccinated. The efficacy of a therapeutic composition of the present invention to protect an animal against disease caused by influenza A viras can be tested in a variety of ways including, but not limited to, detection of antibodies by, for example, hemagglutination inhibition (HAI) tests, detection of cellular immunity within the treated animal, or challenge of the treated animal with viralent equine influenza viras to determine whether the treated animal is resistant to the development of disease. In addition, efficacy of a therapeutic composition of the present invention comprising a cold-adapted equine influenza virus having a dominant interference phenotype to ameliorate or reduce disease- symptoms in an animal previously inoculated or susceptible to inoculation with a virulent, wild-type equine influenza viras can be tested by screening for the reduction or absence of disease symptoms in the treated animal. The present invention also includes methods to produce a therapeutic composition of the present invention. Suitable and preferred methods for making a therapeutic composition of the present invention are disclosed herein. Pertinent steps involved in producing one type of therapeutic composition of the present invention, i.e., a cold-adapted equine influenza viras, include (a) passaging a wild-type equine influenza virus in vitro, for example, in embryonated chicken eggs; (b) selecting viruses that grow at a reduced temperature; (c) repeating the passaging and selection steps one or more times, at progressively lower temperatures, until viras populations are selected which stably grow at the desired lower temperature; and (d) mixing the resulting virus preparation with suitable excipients. The pertinent steps involved in producing another type of therapeutic composition of the present invention, i.e., a reassortant influenza A virus having at least one genome segment of an equine influenza virus generated by adaptation, includes the steps of (a) mixing the genome segments of a donor cold-adapted equine influenza virus, which preferably also has the phenotypes of attenuation, temperature sensitivity, or dominant interference, with the genome segments of a recipient influenza A viras, and (b) selecting reassortant viruses that have at least one identifying phenotype of the donor equine influenza viras. Identifying phenotypes to select for include attenuation, cold- adaptation, temperature sensitivity, and dominant interference. Methods to screen for these phenotypes are well known to those skilled in the art, and are disclosed herein. It is preferable to screen for viruses that at least have the phenotype of attenuation. Using this method to generate a reassortant influenza A viras having at least one genome segment of a equine influenza virus generated by cold-adaptation, one type of reassortant virus to select for is a "6 + 2" reassortant, where the six "internal gene segments," i.e., those coding for the NP, PB2, PB1, PA, M, and NS genes, are derived from the donor cold-adapted equine influenza viras genome, and the two "external gene segments," i.e., those coding for the HA and NA genes, are derived from the recipient influenza A viras. A resultant viras thus produced can have the cold- adapted, attenuated, temperature sensitive, and/or interference phenotypes of the donor cold- adapted equine influenza viras, but the antigenicity of the recipient strain. In another embodiment, a therapeutic composition comprising a cold-adapted equine influenza virus of the present invention can be administered to an animal to treat respiratory disease such as, respiratory disease but not limited to, nasal discharge (also referred to as "snots" by equine veterinarians) which is believed to be due directly or indirectly to equine herpes viras (EHV) or other viruses. As used herein, the term "treat" refers to the ability of a therapeutic composition of the present invention to reduce or eliminate disease, such as respiratory disease in an animal. Such disease is preferably a pre-existing condition and/or is preferably due to recent exposure or subsequent exposure within a few days of treatment to an infectious agent able to cause such disease. A therapeutic composition of the present invention can be safely and effectively administered to equids, preferably equids from about 3 months to about 2 years of age, to treat an infection such as, but not limited to, any viras or bacterium that leads to respiratory disease, preferably upper respiratory disease, either directly or indirectly. Maternal immunity is believed to protect a young animal through about the first three months of life, but between about three to six months of age maternal immunity begins to decrease leaving animals susceptible to infection. A therapeutic composition of the present invention can effectively treat respiratory disease in these animals. A therapeutic composition of the present invention can also be used to inhibit secondary viral and/or bacterial infection in animals. Furthermore a therapeutic composition of the present invention may be used to treat other diseases caused by infectious agents, either directly or indirectly. While not being bound by theory, it is believed that a therapeutic composition of the present invention induces a non-specific interference response which is not dependent on the production of antibodies; rather this response is most likely due to increased cytokine production triggered by the administration of such a therapeutic composition of the present invention, leading to amelioration of disease. Dominant interference refers herein to the ability of an equine influenza virus of the present invention to inhibit growth of the parental wild-type strain, as well as heterologous influenza A viruses. As used herein, non-specific interference refers to the ability of an equine influenza viras of the present invention to inhibit growth of the parental wild-type strain, as well as other infectious agents such as, but not limited to viruses or bacteria, that lead to respiratory disease, preferably before antibody-mediated immunity can be established in response to administration of that virus. A preferred embodiment comprises administering to an animal a therapeutic composition of the present invention comprising a viras selected from the group consisting of a cold-adapted equine influenza virus having a dominant interference phenotype; and a reassortant influenza A viras comprising a portion of an equine influenza viras genome conferring cold-adaptation and dominant interference phenotypes, wherein a therapeutic composition exhibits non-specific interference. A portion refers herein to one or more genome segments, or fragments; in this embodiment thereof that encode the cold-adapted and dominant interference phenotypes. Administration of a therapeutic composition of the present invention to horses suffering from respiratory disease preferably results in reduced signs of disease in less than about 7 days, more preferably in less than 5 days and even more preferably within about 1 to 3 days. The stage of disease can range from early onset with symptoms of nasal discharge and fever to later stages with nasal discharge as the predominant • symptom. A preferable method to treat an animal for disease caused by respiratory disease includes administering to that animal a single dose of a therapeutic composition comprising a cold-adapted equine influenza viras, a reassortant influenza A virus, or genetically-engineered equine influenza viras of the present invention. Such administration can be accomplished as described elsewhere herein. Examples include but are not limited to, use of a syringe fitted with a cannula, or use of a nebulizer fitted over the nose and mouth of the animal to be treated. A suitable dose is a dose that is capable of treating an animal for disease when administered one or more times over a suitable time period. A preferred therapeutic composition of the present invention comprises from about 10 7 TCID 50 units to about 10 8 TCID 50 units of a cold-adapted equine influenza viras or reassortant influenza A viras of the present invention. The method of the present invention may also include administering subsequent doses of a therapeutic composition. In yet another embodiment, a viras of the present invention can be used as an adjuvant to stimulate the immune response of a vaccine against another infectious agent. The following examples are provided for the purposes of illustration and are not intended to limit the scope of the present invention. Example 1 This example discloses the production and phenotypic characterization of several cold-adapted equine influenza viruses of the present invention. A. Parental equine influenza virus, A/equine/Kentucky/1/91 (H3N8) (obtained from Tom Chambers, the University of Kentucky, Lexington, KY) was subjected to cold-adaptation in a foreign host species, i.e., embryonated chicken eggs, in the following manner. Embryonated, 10 or 11-day old chicken eggs, available, for example, from Traslow Farms, Chestertown, MD or from HyVac, Adel, IA, were inoculated with the parental equine influenza virus by injecting about 0.1 milliliter (ml) undiluted AF containing approximately 10 6 plaque forming units (pfu) of viras into the allantoic cavity through a small hole punched in the shell of the egg. The holes in the eggs were sealed with nail polish and the eggs were incubated in a humidified incubator set at the appropriate temperature for three days. Following incubation, the eggs were candled and any non-viable eggs were discarded. AF was harvested from viable embryos by aseptically removing a portion of the egg shell, pulling aside the chorioallantoic membrane (CAM) with sterile forceps and removing the AF with a sterile pipette. The harvested AF was frozen between passages. The AF was then used, either undiluted or diluted 1:1000 in phosphate-buffered saline (PBS) as noted in Table 1, to inoculate a new set of eggs for a second passage, and so on. A total of 69 passages were completed. Earlier passages were done at either about 34°C (passages 1-2) or about 30°C and on subsequent passages, the incubation temperature was shifted down either to about 28°C, or to about 26°C. In order to increase the possibility of the selection of the desired phenotype of a stable, attenuated viras, the initial serial passage was expanded to included five different limbs of the serial passage tree, A through E, as shown in Table 1. *= the infectious allantoic fluid was diluted 1: 1000 in these passages B. Viras isolates carried through the cold- adaptation procedure described in section A were tested for temperature sensitivity, i.e., a phenotype in which the cold- adapted viras grows at the lower, or permissive temperature (e.g., about 34°C), but no longer forms plaques at a higher, or non-permissive temperature (e.g., about 37°C or about 39°C), as follows. At each cold-adaptation passage, the AF was titered by plaque assay at about 34°C. Periodically, individual plaques from the assay were clonally isolated by excision of the plaque area and placement of the excised agar plug in a 96- well tray containing a monolayer of MDCK cells. The 96-well trays were incubated overnight and the yield assayed for temperature sensitivity by CPE assay in duplicate 96- well trays incubated at about 34°C and at about 39°C. The percent of the clones that scored as temperature sensitive mutants by this assay, i.e., the number of viral plaques that grew at 34°C but did not grow at 39°C, divided by the total number of plaques, was calculated, and is shown in Table 2. Temperature sensitive isolates were then evaluated for protein synthesis at the non-permissive temperature by visualization of radiolabeled virus-synthesized proteins by SDS polyacrylamide gel electrophoresis (SDS-PAGE). TABLE 2: Percent of isolated Clones that were temperature sensitive. From the clonal isolates tested for temperature sensitivity, two were selected for further study. Clone EIV-P821 was selected from the 49th passage of limb B and clone EIV-P824 was selected from the 48th passage of limb C, as defined in Table 1. Both of these virus isolates were temperature sensitive, with plaque formation of both isolates inhibited at a temperature of about 39°C. At this temperature, protein synthesis was completely inhibited by EIV-P821, but EIV-P824 exhibited normal levels of protein synthesis. In addition, plaque formation by EIV-P821 was inhibited at a temperature of about 37°C, and at this temperature, late gene expression was inhibited, i.e., normal levels of NP protein were synthesized, reduced or no Ml or HA proteins were synthesized, and enhanced levels of the polymerase proteins were synthesized. The phenotype observed at 37°C, being typified by differential viral protein synthesis, was distinct from the protein synthesis phenotype seen at about 39°C, which was typified by the inhibition of synthesis of all viral proteins. Viras ETV-P821 has been deposited with the American Type Culture Collection (ATCC) under Accession No. ATCC VR-2625, and viras EIV-P824 has been deposited with the ATCC under Accession No. ATCC VR-2624. C. Further characterization of the mutations in isolate ETV-P821 were carried out by reassortment analysis, as follows. Reassortment analysis in influenza virases allows one skilled in the art, under certain circumstances, to correlate phenotypes of a given virus with putative mutations occurring on certain of the eight RNA segments that comprise an influenza A virus genome. This technique is described, for example, in Palese, et al., ibid. A mixed infection of EIV-P821 and an avian influenza virus, A/mallard/New York 6750/78 was performed as follows. MDCK cells were co-infected with EIV-P821 at a multiplicity of infection (MOI) of 2 pfu/cell and A mallard/New York/6750/78 at an MOI of either 2, 5, or 10 pfu/cell. The infected cells were incubated at a temperature of about 34°C. The yields of the various co-infections were titered and individual plaques were isolated at about 34°C, and the resultant clonal isolates were characterized as to whether they were able to grow at about 39°C and about 37°C, and express their genes, i.e., synthesize viral proteins, at about 39°C, about 37°C, and about 34°C. Protein synthesis was evaluated by SDS-PAGE analysis of radiolabeled infected- cell lysates. The HA, NP and NS-1 proteins of the two parent viruses, each of which is encoded by a separate genome segment, were distinguishable by SDS-PAGE analysis, since these particular viral proteins, as derived from either the equine or the avian influenza viras, migrate at different apparent molecular weights. In this way it was possible, at least for the HA, NP, and NS-1 genes, to evaluate whether certain phenotypes of the parent viras, e.g., the temperature sensitive and the protein synthesis phenotypes, co-segregate with the genome segments carrying these genes. The results of the reassortment analyses investigating co-segregation of a) the mutation inhibiting plaque formation, i.e., the induction of CPE, at a non-permissive temperature of about 39°C or b) the mutation inhibiting protein synthesis at a non-permissive temperature of about 39°C with each of the EIV-P821 HA, NP and NS-1 proteins are shown in Tables 3 and 4, respectively. TABLE 3: Reassortment analysis of the EIV-P821 39°C plaque formation phenotype with avian influenza viras, A/mallard/New York/6750/78 1 number of clonal isolates able to induce CPE in tissue culture cells at a temperature of about 39°C. 2 number of clonal isolates inhibited in the ability to induce CPE in tissue culture cells at a temperature of about 39°C. TABLE 4: Reassortment analysis of the EIV-P821 39°C protein synthesis phenotype with avian influenza viras, A/mallard/New York/6750/78 1 number of clonal isolates which synthesize all viral proteins at a temperature of about 39 δ C. 2 number of clonal isolates inhibited in the ability to synthesize all viral proteins at a temperature of about 39°C. The results demonstrated an association of the equine NP gene with a mutation causing the inability of EIV-P821 to form plaques at a non-permissive temperature of about 39°C, but the results did not suggest an association of any of the HA, NP, or NS-1 genes with a mutation causing the inability of EIV-P821 to express viral proteins at a non-permissive temperature of about 39°C. Thus, these data also demonstrated that the plaque formation phenotype and the protein synthesis phenotype observed in viras ETV- P821 were the result of separate mutations. D. Studies were also conducted to determine if cold-adapted equine influenza virases of the present invention have a dominant interference phenotype, that is, whether they dominate in mixed infection with the wild type parental viras A/Kentucky/ 1/91 (H3N8). The dominant interference phenotype of virases ETV-P821 and ETV-P824 were evaluated in the following manner. Separate monolayers of MDCK cells were singly infected with the parental virus A/Kentucky/ 1/91 (H3N8) at an MOI of 2, singly infected with either cold-adapted viras EIV-P821 or EIV-P824 at an MOI of 2, or simultaneously doubly infected with both the parental viras and one of the cold adapted virases at an MOI of 2+2, all at a temperature of about 34 °C. At 24 hours after infection, the media from the cultures were harvested and the viras yields from the various infected cells were measured by duplicate plaque assays performed at temperatures of about 34 °C and about 39 °C. This assay took advantage of the fact that cold adapted equine influenza virases EIV-P821 or EJN-P824 are temperature sensitive and are thus unable to form plaques at a non-permissive temperature of about 39 °C, while the parental viras is able to form plaques at both temperatures, thus making it possible to measure the growth of the parental viras in the presence of the cold adapted viras. Specifically, the dominant interference effect of the cold adapted viras on the growth of the parental viras was quantitated by comparing the viras yield at about 39 °C of the cells singly infected with parental virus to the yield of the parental viras in doubly infected cells. EIV-P821, in mixed infection, was able to reduce the yield of the parental viras by approximately 200 fold, while EIV-P824, in mixed infection, reduced the yield of the parental viras by approximately 3200 fold. This assay therefore showed that cold-adapted equine influenza virases EIV-P821 and EIV-P824 both exhibit the dominant interference phenotype. E. Virus isolate EIV-MSV+5 was derived from EIV-P821, as follows. EIV- P821 was passaged once in eggs, as described above, to produce a Master Seed Viras isolate, denoted herein as EIV-MSV0. EIV-MSV0 was then subjected to passage three additional times in eggs, the viras isolates at the end of each passage being designated EIV-MSV+1, EIV-MSV+2, and EIV-MSV+3, respectively. EIV-MSV+3 was then subjected to two additional passages in MDCK cells, as follows. MDCK cells were grown in 150 cm 2 tissue culture flasks in MEM tissue culture medium with Hanks Salts, containing 10% calf serum. The cells were then washed with sterile PBS and the growth medium was replaced with about 8 ml per flask of infection medium (tissue culture medium comprising MEM with Hanks Salts, 1 μg/ml TPCK trypsin solution, 0.125% bovine serum albumin (BSA), and 10 mM HEPES buffer). MDCK cells were inoculated with AF containing viras EIV-MSV+3 (for the first passage in MDCK cells) or viras stock harvested from EIV-MSV+4 (for the second passage in MDCK cells), and the virases were allowed to adsorb for 1 hour at about 34°C. The inoculum was removed from the cell monolayers, the cells were washed again with PBS, and about 100 ml of infection medium was added per flask. The infected cells were incubated at about 34°C for 24 hours. The virus-infected MDCK cells were harvested by shaking the flasks vigorously to disrapt the cell monolayer, resulting in viras isolates EIV-MS V+4 (the first passage in MDCK cells), and EIV-MSV+5 (the second passage in MDCK cells). Virases EIV-MSVO and EIV-MSV+5 were subjected to phenotypic analysis, as described in section B above, to determine their ability to form plaques and synthesize viral proteins at temperatures of about 34°C, about 37°C, and about 39°C. Both EIV- MSVO and EIV-MSV+5 formed plaques in tissue culture cells at a temperature of about 34°C, and neither virus isolate formed plaques or exhibited detectable viral protein synthesis at a temperature of about 39°C. Viras EIV-MSVO had a similar temperature sensitive phenotype as EIV-P821 at a temperature of about 37°C, i.e., it was inhibited in plaque formation, and late gene expression was inhibited. However, EIV-MSV+5, unlike its parent virus, EIV-P821, did form plaques in tissue culture at a temperature of about 37°C, and at this temperature, the viras synthesized normal amounts of all proteins. Viras EIV-MSV+5 has been deposited with the ATCC under Accession No. ATCC VR-2627. Example 2 Therapeutic compositions of the present invention were produced as follows. A. A large stock of ETV-P821 was propagated in eggs as follows. About 60 specific pathogen-free embryonated chicken eggs were candled and non-viable eggs were discarded. Stock viras was diluted to about 1.0 x 10 5 pfu/ml in sterile PBS. Virus was inoculated into the allantoic cavity of the eggs as described in Example 1 A. After a 3-day incubation in a humidified chamber at a temperature of about 34°C, AF was harvested from the eggs according to the method described in Example 1 A. The harvested AF was mixed with a stabilizer solution, for example A1/A2 stabilizer, available from Diamond Animal Health, Des Moines, IA, at 25 % V/V (stabilizer/AF). The harvested AF was batched in a centrifuge tube and was clarified by centrifugation for 10 minutes at 1000 rpm in an IEC Centra-7R refrigerated table top centrifuge fitted with a swinging bucket rotor. The clarified fluid was distributed into 1-ml cryo vials and was frozen at about -70°C. Virus stocks were titrated on MDCK cells by CPE and plaque assay at about 34°C. B. A large stock of EIV-P821 was propagated in MDCK cells as follows. MDCK cells were grown in 150 cm 2 tissue culture flasks in MEM tissue culture medium with Hanks Salts, containing 10% calf serum. The cells were then washed with sterile PBS and the growth medium was replaced with about 8 ml per flask of infection medium. The MDCK cells were inoculated with viras stock at an MOI ranging from about 0.5 pfu per cell to about 0.005 pfu per cell, and the virases were allowed to adsorb for 1 hour at about 34°C. The inoculum was removed from the cell monolayers, the cells were washed again with PBS, and about 100 ml of infection medium was added per flask. The infected cells were incubated at about 34°C for 24 hours. The virus-infected MDCK cells were harvested by shaking the flasks vigorously to disrupt the cell monolayer and stabilizer solution was added to the flasks at 25% V/V (stabilizer/virus solution). The supernatants were distributed aseptically into cry o vials and frozen at - 70°C. C. Therapeutic compositions comprising certain cold-adapted temperature sensitive equine influenza virases of the present invention were formulated as follows. Just prior to vaccination procedures, such as those described in Examples 3-7 below, stock vials of EIV-P821 or EIV-MS V +5 were thawed and were diluted in an excipient comprising either water, PBS, or in MEM tissue culture medium with Hanks Salts, containing 0.125% bovine serum albumin (BSA-MEM solution) to the desired dilution for administration to animals. The vaccine compositions were held on ice prior to vaccinations. All therapeutic compositions were titered on MDCK cells by standard methods just prior to vaccinations and wherever possible, an amount of the composition, treated identically to those administered to the animals, was titered after the vaccinations to ensure that the viras remained viable during the procedures. Example 3 A therapeutic composition comprising cold-adapted equine influenza virus EIV- P821 was tested for safety and its ability to replicate in three horses showing detectable prior immunity to equine influenza viras as follows. EIV-P821, produced as described in Example 1 A, was grown in eggs as described in Example 2 A and was formulated into a therapeutic composition comprising 10 7 pfu EIV-P821/2ml BSA-MEM solution as described in Example 2C. Three ponies having prior detectable hemagglutination inhibition (HAI) titers to equine influenza viras were inoculated with a therapeutic composition comprising EIV- P821 by the following method. Each pony was given a 2-ml dose of EIV-P821, administered intraiiasally using a syringe fitted with a blunt cannula long enough to reach past the false nostril, 1 ml per nostril. The ponies were observed for approximately 30 minutes immediately following and at approximately four hours after vaccination for immediate type allergic reactions such as sneezing, salivation, labored or irregular breathing, shaking, anaphylaxis, or fever. The animals were further monitored on days 1-11 post- vaccination for delayed type allergic reactions, such as lethargy or anorexia. None of the three ponies in this study exhibited any allergic reactions from the vaccination. The ponies were observed daily, at approximately the same time each day, starting two days before vaccination and continuing through day 11 following vaccination for clinical signs consistent with equine influenza. The ponies were observed for nasal discharge, ocular discharge, anorexia, disposition, heart rate, capillary refill time, respiratory rate, dyspnea, coughing, lung sounds, presence of toxic line on upper gum, and body temperature. In addition submandibular and parietal lymph nodes were palpated and any abnormalities were described. None of the three ponies in this study exhibited any abnormal reactions or overt clinical signs during the observation period. To test for viral shedding in the animals, on days 0 through 11 following vaccination, nasopharyngeal swabs were collected from the ponies as described in Chambers, et al., 1995, Equine Practice, 17, 19-23. Chambers, et al., ibid., is incorporated herein by reference in its entirety. Briefly, two sterile Dacron polyester tipped applicators (available, e.g., from Hardwood Products Co., Guilford, ME) were inserted, together, into each nostril of the ponies. The swabs (four total, two for each nostril) were broken off into a 15-ml conical centrifuge tube containing 2.5 ml of chilled transport medium comprising 5% glycerol, penicillin, streptomycin, neomycin, and gentamycin in PBS at physiological pH. Keeping the samples on wet ice, the swabs were aseptically wrung out into the medium and the nasopharyngeal samples were divided into two aliquots. One aliquot was used to attempt isolation of EIV by inoculation of embryonated eggs, using the method described in Example 1. The AF of the inoculated eggs was then tested for its ability to cause hemagglutination, by standard methods, indicating the presence of equine influenza viras in the AF. On days 2 and 3 post- vaccination, the other aliquots were tested for viras by the Directigen® Flu A test, available from Becton-Dickinson (Cockeysville, MD). Attempts to isolate EIV from the nasopharyngeal secretions of the three animals by egg inoculation were unsuccessful. However on days 2 and 3, all animals tested positive for the presence of viras shedding using the Directigen Flu A test, consistent with the hypothesis that EIV-P821 was replicating in the seropositive ponies. To test the antibody titers to EIV in the inoculated animals described in this example, as well as in the animals described in Examples 4-7, blood was collected from the animals prior to vaccination and on designated days post-vaccination. Seram was isolated and was treated either with trypsin/periodate or kaolin to block the nonspecific inhibitors of hemagglutination present in normal sera. Serum samples were tested for hemagglutination inhibition (HAI) titers against a recent EIV isolate by standard methods, described, for example in the "Supplemental assay method for conducting the hemagglutination inhibition assay for equine influenza viras antibody" (SAM 124), provided by the U.S.D.A. National Veterinary Services Laboratory under 9 CFR 113.2, which is incorporated by reference herein in its entirety. The HAI titers of the three ponies are shown in Table 5. As can be seen, regardless of the initial titer, the seram HAI titers increased at least four-fold in all three animals after vaccination with EIV-P821. These data demonstrate that cold-adapted equine influenza virus EIN-P821 is safe and non-reactogenic in sero-positive ponies, and that these animals exhibited an increase in antibody titer to equine influenza viras, even though they had prior demonstrable titers. TABLE 5: HAI titers of vaccinated animals* Animal HAI Titer (days after vaccination) ID 0 7 14 21 18 40 80 160 160 19 10 20 40 80 25 20 40 320 80 * HAI titers are expressed as the reciprocal of the highest dilution of serum which inhibited hemagglutination of erythrocytes by a recent isolate of equine influenza virus. Example 4 This Example discloses an animal study to evaluate the safety and efficacy of a therapeutic composition comprising cold-adapted equine influenza viras ETV-P821. A therapeutic composition comprising cold-adapted equine influenza viras EIV- P821 was tested for attenuation, as well as its ability to protect horses from challenge with viralent equine influenza viras, as follows. EIV-P821, produced as described in Example 1, was grown in eggs as described in Example 2A and was formulated into a therapeutic composition comprising 10 7 pfu of viras/2ml water, as described in Example 2C. Eight ElV-seronegative ponies were used in this study. Three of the eight ponies were vaccinated with a 2-ml dose comprising 10 7 pfu of the EIV-P821 therapeutic composition, administered intranasally, using methods similar to those described in Example 3. One pony was given 10 7 pfu of the EIV-P821 therapeutic composition, administered orally, by injecting 6 ml of viras into the pharynx, using a 10-ml syringe which was adapted to create a fine spray by the following method. The protruding "seat" for the attachment of needles was sealed off using modeling clay and its cap was left in place. About 10 holes were punched through the bottom of the syringe, i.e., surrounding the "seat," using a 25-gauge needle. The syringe was placed into the interdental space and the viras was forcefully injected into the back of the mouth. The remaining four ponies were held as non- vaccinated controls. The vaccinated ponies were observed for approximately 30 minutes immediately following and at approximately four hours after vaccination for immediate type allergic reactions, and the animals were further monitored on days 1-11 post- vaccination for delayed type allergic reactions, both as described in Example 3. None of the four vaccinated ponies in this study exhibited any abnormal reactions from the vaccination. The ponies were observed daily, at approximately the same time each day, starting two days before viras vaccination and continuing through day 11 following vaccination for clinical signs, such as those described in Example 3. None of the four vaccinated ponies in this study exhibited any clinical signs during the observation period. This result demonstrated that cold-adapted equine influenza virus ETV-P821 exhibits the phenotype of attenuation. To test for viral shedding in the vaccinated animals, on days 0 through 11 following vaccination, nasopharyngeal swabs were collected from the ponies as described in Example 3. The nasopharyngeal samples were tested for viras in embryonated chicken eggs according to the method described in Example 3. As shown in Table 6, viras was isolated from only one vaccinated animal using the egg method. However, as noted in Example 3, the lack of isolation by this method does not preclude the fact that virus replication is taking place, since replication may be detected by more sensitive methods, e.g., the Directigen Flu A test. TABLE 6: Viras isolation in eggs after vaccination Animal Virus Isolation (days after vaccination) ID Route 0 1 2 3 4 5 6 7 8 9 10 11 91 IN - - + + + + + + + + + 666 IN - - 673 IN - - - - - - - - - - - - 674 Oral _ . . . . To test the antibody titers to equine influenza virus in the vaccinated animals, blood was collected from the animals prior to vaccination and on days 7, 14, 21, and 28 post-vaccination. Seram samples were isolated and were tested for hemagglutination inhibition (HAI) titers against a recent EIV isolate according to the methods described in Example 3. The HAI titers of the four vaccinated ponies are shown in Table 7. TABLE 7: HAI titers after vaccination Animal HAI Titer (days after vaccination) ID Route 0 7 14 21 28 91 IN <10 <10 <10 <10 <10 666 IN 10 10 10 20 20 673 IN 10 10 10 20 20 674 Oral 20 40 40 40 40 Unlike the increase in HAI titer observed with the three animals described in the study in Example 3, the animals in this study did not exhibit a significant increase, i.e., greater than four-fold, in HAI titer following vaccination with EJV-P821. Approximately four and one-half months after vaccine viras administration, all 8 ponies, i.e., the four that were vaccinated and the four non-vaccinated controls, were challenged by the following method. For each animal, 10 7 pfu of the viralent equine influenza virus strain A/equine/Kentucky/ 1/91 (H3N8) was suspended in 5 ml of water. A mask was connected to a nebulizer, and the mask was placed over the animal's muzzle, including the nostrils. Five (5) ml was nebulized for each animal, using settings such that it took 5-10 minutes to deliver the full 5 ml. Clinical observations, as described in Example 3, were performed on all animals three days before challenge and daily for 11 days after challenge. Despite the fact that the vaccinated animals did not exhibit marked increases in their HAI titers to equine influenza viras, all four vaccinated animals were protected against equine influenza viras challenge. None of the vaccinated animals showed overt clinical signs or fever, although one of the animals had a minor wheeze for two days. On the other hand, all four non-vaccinated ponies shed virus and developed clinical signs and fever typical of equine influenza viras infection. Thus, this example demonstrates that a therapeutic composition of the present invention can protect horses from equine influenza disease. Example 5 This Example discloses an additional animal study to evaluate attenuation of a therapeutic composition comprising cold-adapted equine influenza viras EIV-P821, and its ability to protect vaccinated horses from subsequent challenge with viralent equine influenza viras. Furthermore, this study evaluated the effect of exercise stress on the safety and efficacy of the therapeutic composition. A therapeutic composition comprising cold-adapted equine influenza virus EIV- P821 was tested for safety and efficacy in horses, as follows. EIV-P821, produced as described in Example 1, was grown in eggs as described in Example 2A and was formulated into a therapeutic composition comprising 10 7 pfu virus/5ml water, as described in Example 2C. Fifteen ponies were used in this study. The ponies were randomly assigned to three groups of five animals each, as shown in Table 8, there being two vaccinated groups and one unvaccinated control group. The ponies in group 2 were exercise stressed before vaccination, while the ponies in vaccinate group 1 were held in a stall. TABLE 8: Vaccination/challenge protocol Group No. Ponies Exercise Vaccine Challenge 1 5 - Day O Day 90 2 5 Days -4 to 0 Day O Day 90 3 5 - - Day 90 The ponies in group 2 were subjected to exercise stress on a treadmill prior to vaccination, as follows. The ponies were acclimated to the use of the treadmill by 6 hours of treadmill use at a walk only. The actual exercise stress involved a daily exercise regimen starting 4 days before and ending on the day of vaccination (immediately prior to vaccination). The treadmill exercise regimen is shown in Table 9. TABLE 9: Exercise regimen for the ponies in Group 2 Speed (m/sec) Time (min.) Incline (°) 1.5 2 0 3.5 2 0 3.5 2 7 4.5 t 2 7 5.5 t 2 7 6.5 t 2 7 7.5 t 2 7 8.5 t 2 7 3.5 2 7 1.5 10 Of t Speed, in meters per second (m/sec) was increased for each animal every 2 minutes until the heart rate reached and maintained ≥ 200 beats per minute Groups 1 and 2 were given a therapeutic composition comprising 10 7 pfu of EIV- P821, by the nebulization method described for the challenge described in Example 4. None of the vaccinated ponies in this study exhibited any immediate or delayed allergic reactions from the vaccination. The ponies were observed daily, at approximately the same time each day, starting two days before vaccination and continuing through day 11 following vaccination for clinical signs, such as those described in Example 3. None of the vaccinated ponies in this study exhibited any overt clinical signs during the observation period. To test for viral shedding in the vaccinated animals, before vaccination and on days 1 through 11 following vaccination, nasopharyngeal swabs were collected from the ponies as described in Example 3. The nasopharyngeal samples were tested for viras in embryonated chicken eggs according to the method described in Example 3. Virus was isolated from the vaccinated animals, i.e., Groups 1 and 2, as shown in Table 10. TABLE 10: Viras isolation after vaccination Animal Virus Isolation (days after vaccination) Group ID Exercise 0 1 2 3 4 5 6 7 8 9 10 11 12 - - + + + + + - + + - - 16 _ . + + + + + _ . _ _ . 1 17 No - - + + + + + + + - + - 165 688 + 7 + + + + 44 435 Yes - - + + + + - 907 - - - + - + + 968 - - - - - + . + To test the antibody titers to equine influenza virus in the vaccinated animals, blood was collected prior to vaccination and on days 7, 14, 21, and 28 post-vaccination. Serum samples were isolated and were tested for HAI titers against a recent EIV isolate according to the methods described in Example 3. These titers are shown in Table 11. TABLE 11: HAI titers after vaccination and after challenge on day 90 On day 90 post vaccination, all 15 ponies were challenged with 10 7 pfu of equine influenza viras strain A/equine/Kentucky/1/91 (H3N8) by the nebulizer method as described in Example 4. Clinical observations, as described in Example 3, were performed on all animals three days before challenge and daily for 11 days after challenge. There were no overt clinical signs observed in any of the vaccinated ponies. Four of the five non- vaccinated ponies developed fever and clinical signs typical of equine influenza virus infection. Thus, this example demonstrates that a therapeutic composition of the present invention protects horses against equine influenza disease, even if the animals are stressed prior to vaccination. Example 6 This Example compared the infectivities of therapeutic compositions of the present invention grown in eggs and grown in tissue culture cells. From a production standpoint, there is an advantage to growing therapeutic compositions of the present invention in tissue culture rather than in embryonated chicken eggs. Equine influenza viras, however, does not grow to as high a titer in cells as in eggs. In addition, the hemagglutinin of the virus requires an extracellular proteolytic cleavage by trypsin-like proteases for infectivity. Since seram contains trypsin inhibitors, virus grown in cell culture must be propagated in serum-free medium that contains trypsin in order to be infectious. It is well known by those skilled in the art that such conditions are less than optimal for the viability of tissue culture cells. In addition, these growth conditions may select for viras with altered binding affinity for equine cells, which may affect viral infectivity since the virus needs to bind efficiently to the animal's nasal mucosa to replicate and to stimulate immunity. Thus, the objective of the study disclosed in this example was to evaluate whether the infectivity of therapeutic compositions of the present invention was adversely affected by growth for multiple passages in in vitro tissue culture. EIV-P821, produced as described in Example 1, was grown in eggs as described in Example 2 A or in MDCK cells as described in Example 2B. In each instance, the viras was passaged five times. EIV-P821 was tested for its cold-adaptation and temperature sensitive phenotypes after each passage. The egg and cell-passaged viras preparations were formulated into therapeutic compositions comprising 10 7 pfu virus/2ml BSA-MEM solution, as described in Example 2C, resulting in an egg-grown EIV-P821 therapeutic composition and an MDCK cell-grown EIV-P821 therapeutic composition, respectively. Eight ponies were used in this study. Seram from each of the animals was tested for HAI titers to equine influenza viras prior to the study. The animals were randomly assigned into one of two groups of four ponies each. Group A received the egg-grown EIV-P821 therapeutic composition, and Group B received the MDCK-grown EIV-P821 therapeutic composition, prepared as described in Example 2B. The therapeutic compositions were administered intranasally by the method described in Example 3. The ponies were observed daily, at approximately the same time each day, starting two days before vaccination and continuing through day 11 following vaccination for allergic reactions or clinical signs as described in Example 3. No allergic reactions or overt clinical signs were observed in any of the animals. Nasopharyngeal swabs were collected before vaccination and daily for 11 days after vaccination. The presence of viras material in the nasal swabs was determined by the detection of CPE on MDCK cells infected as described in Example 1, or by inoculation into eggs and examination of the ability of the infected AF to cause hemagglutination, as described in Example 3. The material was tested for the presence of viras only, and not for titer of viras in the sample. Virus isolation results are listed in Table 12. Blood was collected and seram samples from days 0, 7, 14, 21 and 28 after vaccination were tested for hemagglutination inhibition antibody titer against a recent isolate. HAI titers are also listed in Table 12. TABLE 12: HAI titers and viras isolation after vaccination HAI Titer (DPV 3 ) Virus Isolation ' (DPV 3 ) Group 2 ID 0 7 14 21 28 0 1 2 3 4 5 6 7 i I 9 10 11 31 <10 20 160 160 160 - EC - C EC EC C C EC - - - 37 <10 40 160 160 160 - EC C C EC C C C _ 1 40 <10 20 80 160 80 - EC EC C - C EC C - EC EC - 41 <10 40 160 160 80 - EC EC C EC C EC EC _ 32 <10 <10 80 80 40 - EC - C - C - c - EC - - 34 <10 20 160 160 160 - EC - C EC C EC 2 c _ 35 <10 <10 80 80 40 - EC - C - C - c - EC - - 42 <10 <10 80 80 40 - - - C - C EC EC _ 1 E = Egg isolation positive; C=CPE isolation positive; - = virus not detected by either of the methods 2 Group 1: Virus passaged 5X in MDCK cells; Group 2: Virus passaged 5X in Eggs 3 Days Post-vaccination The results in Table 12 show that there were no significant differences in infectivity or immunogenicity between the egg-grown and MDCK-grown EIV-P821 therapeutic compositions. Example 7 This example evaluated the minimum dose of a therapeutic composition comprising a cold-adapted equine influenza viras required to protect a horse from equine influenza viras infection. The animal studies disclosed in Examples 3-6 indicated that a therapeutic composition of the present invention was efficacious and safe. In those studies, a dose of 10 7 pfu, which correlates to approximately 10 8 TCID 50 units, was used. However, from the standpoints of cost and safety, it is advantageous to use the minimum viras titer that will protect a horse from disease caused by equine influenza viras. In this study, ponies were vaccinated with four different doses of a therapeutic composition comprising a cold-adapted equine influenza viras to determine the minimum dose which protects a horse against viralent equine influenza viras challenge. EIV-P821, produced as described in Example 1A, was passaged and grown in MDCK cells as described in Example 2B and was formulated into a therapeutic composition comprising either 2 x 10 4 , 2 x 10 5 , 2 x 10 6 , or 2 x 10 7 TCID 50 units/1 ml BSA-MEM solution as described in Example 2C. Nineteen horses of various ages and breeds were used for this study. The horses were assigned to four vaccine groups, one group of three horses and three groups of four horses, and one control group of four horses (see Table 13). Each of the ponies in the vaccine groups were given a 1-ml dose of the indicated therapeutic composition, administered intranasally by methods similar to those described in Example 3. TABLE 13: Vaccination protocol The ponies were observed for approximately 30 minutes immediately following and at approximately four hours after vaccination for immediate type reactions, and the animals were further monitored on days 1-11 post-vaccination for delayed type reactions, both as described in Example 3. None of the vaccinated ponies in this study exhibited any abnormal reactions or overt clinical signs from the vaccination. Blood for seram analysis was collected 3 days before vaccination, on days 7, 14, 21, and 28 after vaccination, and after challenge on Days 35 and 42. Seram samples were tested for HAI titers against a recent EIV isolate according to the methods described in Example 3. These titers are shown in Table 14. Prior to challenge on day 29, 2 of the 3 animals in group 1 , 4 of the 4 animals in group 2, 3 of the 4 animals in group 3, and 2 of the 4 animals in group 4 showed at least 4-fold increases in HAI titers after vaccination. In addition, 2 of the 4 control horses also exhibited increases in HAI titers. One interpretation for this result is that the control horses were exposed to vaccine viras transmitted from the vaccinated horses, since all the horses in this study were housed in the same barn. TABLE 14: HAI titers post-vaccination and post-challenge, and challenge results On day 29 post vaccination, all 19 ponies were challenged with equine influenza viras strain A/equine/Kentucky/ 1/91 (H3N8) by the nebulizer method as described in Example 4. The challenge dose was prospectively calculated to contain about 10 s TCID 50 units of challenge viras in a volume of 5 ml for each animal. Clinical observations, as described in Example 3, were monitored beginning two days before challenge, the day of challenge, and for 11 days following challenge. As shown in Table 14, no animals in groups 1 or 2 exhibited clinical signs indicative of equine influenza disease, and only one out of four animals in group 3 became sick. Two out of four animals in group 4 became sick, and only two of the four control animals became sick. The results in Table 14 suggest a correlation between seroconversion and protection from disease, since, for example, the two control animals showing increased HAI titers during the vaccination period did not show clinical signs of equine influenza disease following challenge. Another interpretation, however, was that the actual titer of the challenge virus may have been less than the calculated amount of 10 8 TCID 50 units, since, based on prior results, this level of challenge should have caused disease in all the control animals. Nonetheless, the levels of seroconversion and the lack of clinical signs in the groups that received a therapeutic composition comprising at least 2 x 10 6 TCID 50 units of a cold-adapted equine influenza viras suggests that this amount was sufficient to protect a horse against equine influenza disease. Furthermore, a dose of 2xl0 5 TCID 50 units induced seroconversion and gave clinical protection from challenge in 3 out of 4 horses, and thus even this amount may be sufficient to confer significant protection in horses against equine influenza disease. Example 8 This example discloses reports of a non-specific interference effect of a therapeutic composition comprising cold-adapted equine influenza viras EIV-P821. A therapeutic composition comprising cold-adapted equine influenza viras EIV- P821, produced as described in Example 1, was grown in eggs similarly to the procedure described in Example 2A, was expanded by passage in MDCK cells similarly to the procedure described in Example 2B, and was formulated into a therapeutic composition as described in Example 2C. Thirty-four horses on 3 farms were involved in these observations. All the horses had a nasal discharge from undetermined causes. Two horses about 1 to 2 years old on farm 1, 15 horses about 1 to 2 years old on farm 2 and 8 foals about age 3 to 6 months on farm 3 were each administered a therapeutic composition produced as described in Example 2, intranasally into one nostril using a syringe with a delivery device tip attached to the end, with a 1.0 ml dose comprising about 10 7,5 TCID 50 of the therapeutic composition. On farm 3, 9 foals with nasal discharge did not receive a therapeutic composition of the present invention. On farm 1, the nasal discharge in the 2 horses improved by 2 days after administration of the therapeutic composition. On farm 2, the nasal discharge in the 15 horses improved by 1 day after administration of the therapeutic composition. On farm 3, the nasal discharge improved in 7 of the 8 vaccinated foals by 2 days after administration of the therapeutic composition. The nasal discharge in the 9 foals that were not administered the therapeutic composition did not improve. Example 9 , This example discloses a report of an antiviral effect of a therapeutic composition comprising cold- adapted equine influenza viras EIV-P821. A therapeutic composition comprising cold-adapted equine influenza virus EIV- P821, produced as described in Example 1, was grown in eggs similarly to the procedure described in Example 2A, was expanded by passage in MDCK cells similarly to the procedure described in Example 2B, and was formulated into a therapeutic composition as described in Example 2C. One hundred horses, all of whom were showing clinical signs of influenza, were administered the therapeutic composition in a manner as described in Example 8 . At the time of administration, about 20 to 30 horses were in the early stage of influenza (with serous nasal discharge and high temperature) and about 70 to 80 horses were in a later stage of influenza (mucopuralent nasal discharge, most with no fever). The veterinarian also treated about 30 of the horses in the later stage of influenza with antibiotic. The clinical signs of infection cleared within 3 days of treatment in 90 of the horses (including all the horses in the early stage of influenza, none of which were given antibiotics). The other 10 horses were continued on antibiotic and clinical signs of infection were cleared in a week. All the horses were back in race training within 10 days of initiation of treatment. Prior to therapeutic compositions of the present invention, veterinarians treated sick horses with antibiotics alone, and it took at least 2 weeks for the horses to clear the clinical signs of infection and at least 3 weeks before the horses were back in race training In fact, in about 50% of the cases the veterinarian would have to switch antibiotics and continue to treat the horses. While various embodiments of the present invention have been described in detail, it is apparent that modifications and adaptations of those embodiments will occur to those skilled in the art. It is to be expressly understood, however, that such modifications and adaptations are within the scope of the present invention, as set forth in the following claims.

Claims: What is claimed is: 1. A method to treat an animal for respiratory disease comprising administering to said animal a therapeutic composition comprising a viras selected from the group consisting of: (a) a cold-adapted equine influenza viras; and (b) a reassortant influenza A viras comprising at least one genome segment of an equine influenza viras generated by cold-adaptation, said equine influenza viras having an identifying phenotype selected from the group consisting of cold-adaptation, temperature sensitivity, dominant interference, and attenuation, wherein said equine influenza virus genome segment confers at least one of said identifying phenotypes to said reassortant viras. 2. A method to treat an animal for respiratory disease comprising administering to said animal a therapeutic composition comprising a virus selected from the group consisting of (a) a cold-adapted equine influenza viras having a dominant interference phenotype and (b) a reassortant influenza A viras comprising a portion of an equine influenza viras genome conferring cold-adaptation and dominant interference phenotypes, wherein said therapeutic composition exhibits non-specific interference. 3. The invention of Claim 1 or 2, wherein said respiratory disease is caused by viral or bacterial infection or a combination thereof. 4. The invention of Claim 1 or 2, wherein said respiratory disease is caused by influenza. 5. The invention of Claim 1 or 2, wherein said animal is an equid. 6. The invention of Claim 1 or 2, wherein said therapeutic composition comprises a cold-adapted equine influenza viras, wherein said disease is caused by viral or bacterial infection or a combination thereof, and wherein said therapeutic composition is administered as a treatment to an equid, thereby eliciting a non-specific interference response against viral or bacterial infection or a combination thereof in said equid. 7. The invention of Claim 1 or 2, wherein said therapeutic composition comprises from about 10 7 TCID 50 units to about 10 8 TCID 50 units of said viras. 8. The invention of Claim 1 or 2, wherein said therapeutic composition treats an equid for respiratory disease that exhibits nasal discharge as the major clinical sign of infection. 9. The invention of Claim 1 or 2, wherein said therapeutic composition treats an equid from about 3 months to about 2 years of age against nasal discharge. 10. The invention of Claim 1 or 2, wherein said therapeutic composition treats an equid for respiratory disease in which major clinical signs of disease are reduced within about 7 days. 11. The invention of Claim 1 or 2, wherein said therapeutic composition inhibits viral or bacterial infection, or a combination thereof. 12. The invention of Claim 1 or 2, wherein said therapeutic composition inhibits secondary viral or bacterial infection, or a combination thereof. 13. The invention of Claim 1 or 2, wherein said respiratory disease is equine influenza, and wherein said therapeutic composition exhibits dominant interference. 14. The invention of Claim 1 or 2, wherein said therapeutic composition treats an equid for respiratory disease that exhibits nasal discharge and fever as early signs of infection. 15. The invention of Claim 1 or 2, wherein said therapeutic composition treats an equid for respiratory disease in which major clinical signs of disease are reduced within about 7 days, and race training of the equid can resume within about 10 days of treatment. 16. The invention of Claim 1 or 2, wherein said therapeutic composition has an anti-viral effect.

Inventors: DOWLING PATRICIA W, YOUNGNER JULIUS S, DOWLING, PATRICIA, W., YOUNGNER, JULIUS, S.
Applicants: DOWLING PATRICIA W, UNIV PITTSBURGH, YOUNGNER JULIUS S, DOWLING, PATRICIA, W., THE UNIVERSITY OF PITTSBURGH - OF THE COMMONWEALTH SYSTEM OF HIGHER EDUCATION, YOUNGNER, JULIUS, S.
Application year: 2001
Main classification: A61K39
IPC codes: A01K13, A61K39, A61P11, A61P31, C12N7