Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Phase II, Randomized, Double-blind, Vaccine-controlled Dose-escalating Study to Evaluate the Immunogenicity, Reactogenicity and Safety of Oral Live Attenuated Human Rotavirus (HRV) Vaccine (Rotavin-M1) in Healthy Infants in Vietnam
Brief Summary: The purpose of this study is to evaluate the safety and immunogenicity of Rotavin-M1 produced by the Center for Research and Production of Vaccines and Biologicals (POLYVAC) in infants in Vietnam. In addition, we evaluate different dosages and schedules to determine the best regimen to test in a clinical trial.


Options:
A: Inclusion Criteria:

* Subjects who the investigator believes that their parents/guardians can and will comply with the requirements of the protocol should be enrolled in the study.
* A male or female child between, and including, 5 and 10 weeks of age at the time of the first study vaccination.
* Written informed consent obtained from the parent or guardian of the subject who is of legal age
* Healthy subjects as established by medical history and clinical examination before entering into the study.
* In South Africa, birth weight \> 2000 grams or if weight unknown, gestation period \> 36 weeks.

Exclusion Criteria:

* Use of any investigational or non-registered product (drug or vaccine) other than the study vaccine(s) 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
* Planned administration of a vaccine not foreseen by the study protocol within 14 days before each dose of study vaccine(s) and ending 14 days after.
* Chronic administration (defined as more than 14 days) of immunosuppressants since birth.
* History of use of experimental rotavirus vaccine.
* Previous routine vaccination except Bacille Calmette-Guérin (BCG), hepatitis B virus (HBV) and oral poliovirus (OPV) vaccination at birth
* Any clinically significant history of chronic gastrointestinal disease including any uncorrected congenital malformation of the gastrointestinal tract, intussusception or other medical condition determined to be serious by the investigator.
* Any confirmed or suspected immunosuppressive or immunodeficient condition based on medical history and physical examination
* History of allergic disease or reaction likely to be exacerbated by any component of the vaccine.
* Acute disease at the time of enrolment.
* Gastroenteritis within 7 days preceding the first study vaccine administration
* Previous confirmed occurrence of rotavirus gastroenteritis (RV GE).
* A family history of congenital or hereditary immunodeficiency.
* Administration of immunoglobulins and/or blood products since birth or planned administration during the study period.
* History of any neurologic disorders or seizures.
* Acute or chronic, clinically significant pulmonary, cardiovascular, hepatic or renal functional abnormality, as determined by physical examination or laboratory screening tests.
B: Inclusion Criteria:

* A male or female infant at least 6 weeks of age and not older than 20 weeks of age at the time of first dose of Rotarix.
* An infant whose parent or guardian's primary residence, at the time of first EPI vaccinations, is a village selected to receive Rotarix.
* Written informed consent obtained from the parent or guardian of the subject, prior to the subject's first study vaccination

Exclusion Criteria:

* Hypersensitivity to the active substance or any component in the vaccine
* Hypersensitivity after previous administration of rotavirus vaccines.
* Previous history of intussusception.
* Subjects with uncorrected congenital malformation of the gastrointestinal tract that would predispose for intussusception.
* Infants with known or suspected immunodeficiency.
* Administration of Rotarix should be postponed in subjects suffering from an acute severe febrile illness only if that illness also results in postponement of other EPI vaccinations.
C: Inclusion Criteria:

* At dose 1

  1. A healthy male or female, 6 to 12 weeks of age (42 days to 84 days of age).
  2. Full term gestation (\>=37 weeks).
  3. Birth weight of the subject should be \>=2.5 kg.
  4. Healthy subjects as established by medical history and clinical examination before entering into the study.
  5. Did not use any dose of Rota virus vaccine.
  6. Written informed consent obtained from the parent or guardian of the subject.
* At dose 2

  1. Received dose 1.
  2. Oral informed consent obtained from the parent or guardian of the subject for continuing participate the study.
* At dose 3

  1. Received both dose 1 and dose 2.
  2. Oral informed consent obtained from the parent or guardian of the subject for continuing participate the study.

Exclusion Criteria:

* At dose 1

  1. Has a chronic disease (cardiovascular, liver, kidney disease).
  2. Acute disease at the time of enrolment.
  3. Administering corticosteroids (\> 1mg/kg/day).
  4. Received any immunosuppressive therapy within 4 week before vaccination (Administration of immunoglobulins and/or any blood product or corticosteroids for \>2 weeks).
  5. Immunosuppressive or immunodeficient condition.
  6. Family has immunosuppressive or immunodeficient condition medical history.
  7. History of high fever convulsion.
  8. Allergic or reaction with any component of vaccine, includes anaphylactic shock with any antibiotic.
  9. Preterm of gestation delivery (gestation period \< 37 weeks).
  10. Low birth weight (\<2.5 kg).
  11. Fever (axillary temperature \>38oC) within 3 days before or on the day of vaccination.
  12. Malnutrition.
  13. Has any type of blood disorder, leukemia, or malignant tumor which can affect the bone marrow or lymph system.
  14. Use of any investigational or non-registered product (unlicensed drug or vaccine) other than the study vaccine within 30 days preceding the first dose of study vaccine, or planned use during the study period.
* At dose 2

  1. Acute disease at the time of 2nd dose.
  2. Administering corticosteroids (\> 1mg/kg/day).
  3. Received any immunosuppressive therapy within 4 week before vaccination (Administration of immunoglobulins and/or any blood product or corticosteroids for \>2 weeks).
  4. History of allergic disease or reactions likely to be exacerbated by any component of the study vaccine.
  5. Fever (axillary temperature \>38oC) within 3 days before or on the day of vaccination.
  6. Has any type of blood disorder, leukemia, or malignant tumor which can affect the bone marrow or lymph system.
  7. Use of any investigational or non-registered product (unlicensed drug or vaccine) other than the study vaccine during the study period.
* At dose 3

  1. Acute disease at the time of 3rd dose.
  2. Administering corticosteroids (\> 1mg/kg/day).
  3. Received any immunosuppressive therapy within 4 week before vaccination (Administration of immunoglobulins and/or any blood product or corticosteroids for \>2 weeks).
  4. History of allergic disease or reactions likely to be exacerbated by any component of the study vaccine.
  5. Fever (axillary temperature \>38oC) within 3 days before or on the day of vaccination.
  6. Has any type of blood disorder, leukemia, or malignant tumor which can affect the bone marrow or lymph system.
  7. Use of any investigational or non-registered product (unlicensed drug or vaccine) other than the study vaccine during the study period.
D: Inclusion criteria:

* Healthy infants 6-13 weeks of age at the time of the first study vaccination whose parent/guardian sign a written informed consent and whose parents/guardians can and will comply with the requirements of the protocol (e.g., completion of the diary cards, return for follow-up visits)

Exclusion criteria:

* Use of any investigational or non-registered product (drug or vaccine) other than the study vaccine(s) within 30 days preceding the first dose of study vaccine or placebo, or planned use during the study period
* Chronic administration (defined as more than 14 days) of immunosuppressants or other immune-modifying drugs since birth. (Topical steroids are allowed.)
* Child is unlikely to remain in the study area for the duration of the study
* Any confirmed or suspected immunosuppressive or immunodeficient condition, including human immunodeficiency virus (HIV) infection
* History of allergic disease or reaction likely to be exacerbated by any component of the vaccine
* Administration of immunoglobulins and/or blood products since birth or planned administration during the study period
* Any clinically significant history of chronic gastrointestinal disease including any uncorrected congenital malformation of the gastrointestinal tract or other serious medical condition as determined by the investigator

Answer: C