Please select the eligibility criteria that correspond to the clinical trial below.
Title: Predictors of Poor Immune Response to Rotavirus Vaccine in Infants
Brief Summary: This will be a randomized study with the primary objective of assessing the impact of withholding versus encouraging breastfeeding on the immunogenicity of Rotarix® in infants.

Enrolled subjects will all be administered Rotarix®, at ages 6 to 7 weeks, and at10 -14 weeks. The subjects will be randomized into one of the two study arms. In one of the group caregivers will be advised to breastfeed immediately prior to and after each dose of the vaccine while in the other group caregivers will be advised to withhold breastfeeding for 30 minutes before and after each dose of the vaccine. The other childhood vaccines i.e. OPV and Pentavalent will be administered at least 30 minutes after administration of Rotarix®, The enrolled subjects will be followed up for 4 weeks after the 2nd dose of Rotarix®.


Options:
A: Inclusion Criteria:

* Healthy male or female infant between, and including, 6 and 12 weeks of age born after a gestation period of 36 to 42 weeks or a birth weight of \>2000g.
* Written informed consent obtained from the parent or guardian of the subject.

Exclusion Criteria:

* Planned administration of oral polio vaccine during the period starting from 2 weeks before each dose of study vaccine(s) and ending 2 weeks after.
* Any confirmed or suspected immunosuppressive or immunodeficient condition, including human immunodeficiency virus (HIV) infection
* History of diphtheria, tetanus, pertussis, Hib disease and/ or hepatitis B.
* Previous vaccination against diphtheria, tetanus, pertussis, and/or Haemophilus influenzae type b.
* History of allergic disease
* Any clinically significant history of chronic gastrointestinal disease including any uncorrected congenital malformation of the GI tract or other serious medical condition as determined by the investigator.
* Gastroenteritis within 7 days preceding the study vaccine administration (warrants deferral of the vaccination)
* Previous confirmed occurrence of RV GE.
* Household contact with an immunosuppressed individual or pregnant women.
* Administration of immunoglobulins and/or blood products since birth or planned administration during the study period
B: Inclusion Criteria:

1. At least one parent(s) or legally acceptable representative's consent for participation and are able to understand study procedures
2. Subjects aged 6 to 7 weeks at recruitment
3. No plans to move in the next 4 months
4. Weight for age not ≤ -3 SD of WHO child growth standards

Exclusion Criteria:

1. Infant not breastfed
2. Administration of rotavirus vaccine in the past
3. Known immunodeficiency disease, including HIV infection in the subject or the mother
4. Known chronic enteric disease
5. Diarrhea on the day of enrollment (temporary exclusion)
6. Any illness requiring hospitalization (temporary exclusion)
7. Any other conditions which in the judgment of the investigator warrant exclusion (e.g. no exclusion criteria but seems 'ill', investigators suspects neglect)
C: Inclusion Criteria:

* Age 4 weeks through 12 weeks at Dose 1
* Parent able to understand study procedures and give consent

Exclusion Criteria:

* Clinical evidence of active gastrointestinal disease
* Subjects who are currently or expected to participate in other studies of investigational products during the 6 weeks after receiving the last dose of RotaTeq™/placebo
D: Inclusion Criteria:

At dose 1

* Healthy male or female, 18 to 40 years of age,
* Free of disease,
* Written informed consent obtained from subjects. At dose 2
* Received dose 1.
* Oral informed consent obtained from subject for continuing participate the study.

Exclusion Criteria:

At dose 1

1. Pregnant woman or planning to be pregnant during the study period.
2. Has a chronic disease (cardiovascular, liver, kidney disease).
3. Acute disease at the time of enrolment.
4. Administering corticosteroids (\> 1mg/kg/day).
5. Received any immunosuppressive therapy within 4 week before vaccination (Administration of immunoglobulins and/or any blood product or corticosteroids for \>2 weeks).
6. Immunosuppressive or immunodeficient condition.
7. Allergic or reaction with any component of vaccine, includes anaphylactic and shock with any antibiotic.
8. Fever (axillary temperature \>38oC) within 3 days before or on the day of vaccination.
9. Has any type of blood disorder, leukemia, or malignant tumor which can affect the bone marrow or lymph system.
10. Use of any investigational or non-registered product (unlicensed drug or vaccine) other than the study vaccine during the study period.

At dose 2

1. Pregnant woman or planning to be pregnant in next 1 month.
2. Acute disease at the time of 2nd dose.
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. History of allergic disease or reactions likely to be exacerbated by any component of the study vaccine.
7. Fever (axillary temperature \>38oC) within 3 days before or on the day of vaccination.
8. Has any type of blood disorder, leukemia, or malignant tumor which can affect the bone marrow or lymph system.
9. Use of any investigational or non-registered product (unlicensed drug or vaccine) other than the study vaccine during the study period.

Answer: B