Please select the eligibility criteria that correspond to the clinical trial below.
Title: Immunogenicity of the Human Rotavirus Vaccine (Rotarix™) at Varying Schedules, Doses, and Ages in Rural Ghana
Brief Summary: The purpose of this study is to determine whether giving the Human Rotavirus Vaccine on alternate dosing schedules will enhance the immune response to the vaccine in a low-resource, high-burden country in Africa. Alternate dosing schedules studied include giving the 2-dose vaccine schedule at a slightly older age and giving an additional dose of the vaccine.


Options:
A: Inclusion Criteria:

* Between 42 and 55 days of age at the time of enrollment.
* Healthy infant free of chronic or serious medical condition as determined by history and physical examination at the time of study enrollment.
* Parents/guardians of each subject are able to understand and follow study procedures and agree to participate in the study by providing parental/guardian permission.

Exclusion Criteria:

* If child has previously had intussusception or abdominal surgery.
* Use of any immunosuppressive drugs or immunoglobulin and/or blood product use since birth or anticipated during study period.
* Current enrollment in any other intervention trial or use of any investigational drug or vaccine throughout the study period.
* Birthweight less than 2000 grams or gestation \< 36 weeks, if this information is available.
* Any subject who reports plan to leave the study area before the completion of the study (i.e., relocation, migration, etc.).
* Another child living in the same compound is already enrolled in the trial (i.e., only one participant can be enrolled per compound).
* After the rotavirus vaccine is introduced into the routine EPI system in Navrongo: Another child in the compound is less than 16 weeks of age.
* The child has received rotavirus vaccine outside of this study.
B: Inclusion criteria:

* Healthy infants aged 6 weeks±1 at first study vaccination.

Exclusion criteria:

* Malnutrition, no history of rotavirus gastroenteritis, allergic disease or chronic gastrointestinal disease, not received protocol-prohibited treatment.
C: "Inclusion criteria:

* A male or female between, and including, 8 and 10 weeks of age at the time of the first vaccination.
* Written informed consent obtained from the parent or guardian of the subject.
* Free of obvious health problems as established by medical history and clinical examination before entering into the study.
* The subjects should have been administered the first dose of DTP/ OPV/ hepatitis B vaccines as per the local universal immunization program at 6 weeks of age.

Exclusion criteria:

* Use of any investigational or non-registered product (drug or vaccine) other than the study vaccine or the routine UIP vaccines within 30 days preceding the first dose of study vaccine, or planned use during the study period.
* Chronic administration (defined as more than 14 days) of immunosuppressants or other immune-modifying drugs since birth. (For corticosteroids, this will mean prednisone, or equivalent, \>= 0.5 mg/kg/day. Inhaled and topical steroids are allowed.)
* Any chronic drug therapy to be continued during the study period.
* Administration of a vaccine not foreseen by the study protocol within 6 weeks of the first dose of vaccine or planned administration during the study of a vaccine not foreseen by the study protocol, with the exception of diphtheria, tetanus, pertussis, hepatitis B, Haemophilus influenzae type b (Hib), OPV and vaccination against tuberculosis, which can be given with at least two weeks separation from the first and subsequent dose of the study vaccine.
* Prior administration of experimental rotavirus vaccine.
* History of confirmed rotavirus gastroenteritis.
* 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.
* Any confirmed or suspected immunosuppressive or immunodeficient condition, including human immunodeficiency virus (HIV) infection based on physical examination (no laboratory testing is required).
* A family history of congenital or hereditary immunodeficiency.
* History of allergic disease or reactions likely to be exacerbated by any component of the vaccine.
* Major congenital defects or serious chronic illness.
* History of any neurologic disorders or seizures.
* Acute disease at the time of enrolment.
* Gastroenteritis (diarrhea) within 7 days preceding the study vaccine administration (warrants deferral of the vaccination).
* Acute or chronic, clinically significant pulmonary, cardiovascular, hepatic or renal functional abnormality, as determined by physical examination or medical history.
* Administration of immunoglobulins and/or blood products since birth or planned administration during the study period. Oral intake of immunoglobulins via breastfeeding is allowed.
D: Inclusion Criteria:

* Healthy infants at least 6 weeks (42 days) and up to 12 weeks (84 days) of age at the time of the first study vaccination
* Parent/legal guardian agrees to participate by giving written informed consent and is willing and able to comply with study requirements

Exclusion Criteria:

* History of congenital abdominal disorders, prior rotavirus gastroenteritis, chronic diarrhea, failure to thrive, or abdominal surgery
* History of intussusception
* Impairment of immunological function, including Severe Combined Immunodeficiency (SCID)
* Acute disease, severe chronic disease, or chronic disease during the acute period
* Uncontrolled epilepsy, encephalopathy, seizure, or other progressive neurological disease
* Hypersensitivity to any component of the rotavirus vaccine, OPV, or DTaP
* Prior receipt of any rotavirus vaccine
* Fever, with an axillary temperature \>=37.5 °C (or equivalent) within 24 hours before study vaccination (study vaccination can be deferred until complete resolution of febrile illness)
* Clinical evidence of active gastrointestinal illness
* Received intramuscular, oral, or intravenous corticosteroid treatment since birth (topical, ophthalmic, and inhaled steroids are permitted)
* Resides in a household with an immunocompromised person
* Receipt of a blood transfusion or blood products, including immunoglobulins
* Participation in another interventional study within 14 days before the first study vaccination or during the study
* Receipt of an investigational or non-registered product other than the study vaccine within 30 days before the first study vaccination or during the study
* For participants in immunogenicity arms: inability to obtain a blood specimen at randomization visit (note: the visit may be rescheduled so that a baseline specimen may be obtained); history of polio, diphtheria, tetanus, or pertussis disease; previous vaccination against diphtheria, tetanus, pertussis, or poliomyelitis
* Any condition which, in the opinion of the investigator, may interfere with the evaluation of the study objectives

Answer: A