Please select the eligibility criteria that correspond to the clinical trial below.
Title: An Open-label, Randomised, Comparative, Multi-centre Study of the Immunogenicity and Safety of a 1-dose Regimen and Different 2-dose Regimens of a Zoster Vaccine (Live), ZOSTAVAX ®, in Subjects ≥ 70 Years of Age
Brief Summary: Primary objective:

Immunogenicity To demonstrate that a second dose of ZOSTAVAX® elicits higher varicella-zoster virus (VZV) antibody titres than a first dose of ZOSTAVAX® whether given as a 0-1 month schedule or as a 0-3 month schedule in subjects ≥70 years of age as measured at 4 weeks post-vaccination

Secondary objectives Immunogenicity

* To summarise the VZV antibody titres at 4 weeks post-vaccination after a 1-dose regimen and 4 weeks post-vaccination after each dose of each 2-doses regimen of ZOSTAVAX®.
* To compare the VZV antibody titres at 12 months after completion of a 1-dose regimen with the VZV antibody titres at 12 months after completion of each 2-doses regimen of ZOSTAVAX®
* To summarise the VZV antibody titres at 24 and 36 months after completion of a 1-dose regimen and at 24 and 36 months after completion of each 2-doses regimen of ZOSTAVAX®


Options:
A: Inclusion Criteria:

* Subjects who the investigator believes will comply with the requirements of the protocol;
* Written informed consent obtained from the subject;
* A male or female aged 50 years or older at the time of the first vaccination;
* Female subjects of non-childbearing potential may be enrolled in the study;

For this study population, non-childbearing potential is defined as current tubal ligation, hysterectomy, ovariectomy or post-menopause.

OR Female subjects of childbearing potential may be enrolled in the study, if the subject has practiced adequate contraception for 30 days prior to vaccination, and has a negative urine pregnancy test on the day of vaccination, and has agreed to continue adequate contraception during the entire treatment period and for 2 months after completion of the vaccination series;

Exclusion Criteria:

* Use of any investigational or non-registered product other than the study vaccine within 30 days preceding the first dose of study vaccine, or planned use during the study period;
* Concurrently participating in another clinical study, at any time during the study period, in which the subject has been or will be exposed to an investigational or a non-investigational product;
* Any confirmed or suspected immunosuppressive or immunodeficient condition resulting from disease or immunosuppressive/cytotoxic therapy;
* History of HZ;
* Previous vaccination against varicella or HZ;
* History of allergic disease or reactions likely to be exacerbated by any component of the vaccine. Additionally, consider allergic reactions to other material or equipment related to study participation;
* Significant underlying illness that in the opinion of the investigator would be expected to prevent completion of the study;
* Receipt of immunoglobulins and/or any blood products within the 90 days preceding the first dose of study vaccine or planned administration during the study period;
* Administration or planned administration of any other immunizations within 30 days before the first or second study vaccination or scheduled within 30 days after study vaccination. However, licensed non-replicating vaccines may be administered up to 8 days prior to each dose and/or at least 14 days after any dose of study vaccine;
* Any other condition that, in the opinion of the investigator, might interfere with the evaluations required by the study;
* Acute disease and/or fever at the time of enrollment;
* Chronic administration of immunosuppressants or other immune-modifying drugs within six months prior to the first vaccine dose.
* Pregnant or lactating female;
* Female planning to become pregnant or planning to discontinue contraceptive precautions.
B: Inclusion Criteria:

1. Age ≥ 70 years
2. Varicella history-positive or residence for \> 30 years in a country with endemic VZV infection
3. Signed informed consent form prior to any study procedure

Exclusion Criteria:

1. Febrile illness within the last 72 hours before the first vaccination
2. Prior herpes-zoster episode clinically diagnosed by a physician
3. Prior receipt of varicella or zoster vaccine
4. Exposure to varicella or herpes-zoster within the 4 weeks prior to the first vaccination
5. Significant underlying illness preventing completion of the study vaccination schedules,
6. Known active tuberculosis,
7. Immune deficiency disorder, including active neoplastic disease within the prior 5 years,
8. Immune function impairment caused by medical condition or immunosuppressive therapy, or any other cause,
9. Receipt of any inactivated vaccine within the 2 weeks prior to the first vaccination,
10. Receipt of any other live vaccine within the 4 weeks prior to the first vaccination,
11. Receipt of immunoglobulins or blood-derived products within the 5 months prior to the first vaccination,
12. Concomitant use of non-topical antiviral therapy
C: Inclusion Criteria:

* Subjects who the investigator believes that they can and will comply with the requirements of the protocol should be enrolled in the study;
* Subjects who successfully completed the primary study and who did not receive Varilrix in the primary study;
* Written informed consent obtained from the subject;
* Free of obvious health problems as established by medical history and clinical examination before entering into the study.

Exclusion Criteria:

* Use of any investigational or non-registered product (drug or vaccine) within 1 month preceding the study start, or planned use during the study period;
* Chronic administration (defined as more than 14 days) of immunosuppressants or other immune-modifying drugs within three months prior to the first study procedure, including corticosteroids, except inhaled and topical steroids are allowed;
* Administration or planned administration of a vaccine not foreseen by the study protocol within 2 weeks before the first study procedure, with the exception of the Influenza vaccine, which can be administered 1 week preceding the first study procedure;
* Previous vaccination against HZ, except the study vaccine administered in the primary study;
* History of HZ (shingles);
* Any confirmed or suspected immunosuppressive or immunodeficient condition based on medical history and physical examination;
* Administration of immunoglobulins and/or any blood products within the 3 months preceding the first study procedure or planned administration during the study period.
D: Inclusion Criteria:

* Adults 60 years of age and older.
* History of Chickenpox.
* Have given written informed consent prior to enrollment.
* History of varicella or long-term (greater than or equal to 30 years) residence in the continental USA.

Exclusion Criteria:

* No history of shingles, no current history of immune suppression (e.g. malignancy or neoplastic disease, corticosteroid therapy).
* No immunosuppression resulting from disease (e.g., malignancy; HIV infection), corticosteroids (except intermittent topical or inhaled corticosteroid \[greater than 800 mcg/day beclomethasone dipropionate or equivalent\]), or other immunosuppressive/cytotoxic therapy (cancer chemotherapy or organ transplantation).
* No active neoplastic disease (except local skin cancer or other malignancies \[e.g., prostate cancer\] that are stable in the absence of immunosuppressive/cytotoxic therapy).
* No prior Herpes Zoster.
* No prior receipt of varicella vaccine.
* No allergic sensitivity to neomycin.
* No history of anaphylactoid reaction to gelatin.
* No significant underlying illness that would be expected to prevent completion of the study (e.g., life-threatening disease likely to limit survival to less than 5 years).
* Not ambulatory (must not be bed-ridden or homebound).
* No receipt of immune globulin or any other blood product within 3 months before or planned during the 3-5 year study period.
* No receipt of any other immunizations within one month before study vaccination (2 weeks in the case of inactivated influenza vaccines or other non-replicating immunization products \[e.g., dT, pneumococcal vaccine, hepatitis A vaccine, hepatitis B vaccine\]), or scheduled within 6 weeks after study vaccination.
* Not currently receiving antiviral therapy.
* No other condition (e.g., extensive psoriasis, chronic pain syndrome, cognitive impairment, severe hearing loss) that, in the opinion of the investigator, might interfere with the evaluations required by the study.
* No intercurrent illness (e.g., urinary tract infection, influenza) that might interfere with the interpretation of the study.
* No females who are pre-menopausal.
* No subjects unlikely to adhere to protocol follow-up.
* No subjects involved in a conflicting (vaccine or investigational drug) clinical trial.

Answer: B