The main objectives of this study are to determine vaccine efficacy against severe rotavirus (RV) gastroenteritis (GE) during the period starting from 2 weeks after Dose 2 until two years of age and to determine the safety of GSK Biologicals' HRV vaccine with respect to definite intussusception (IS) within 31 days (Day 0-Day 30) after each HRV vaccine dose.

The study has two groups: Group HRV and Group Placebo. Two oral doses administered to healthy infants who are 6-12 weeks of age in Hongkong and Taiwan or 11-17 weeks of age in Singapore, according to a 0, 1 to 2-month schedule. Routine vaccinations are given concomitantly with the study vaccines at 2 or 3 and 4 months of age according to each local country regulation. Whenever OPV is used, a minimum 2-week interval should be observed between HRV vaccine and OPV doses.

Inclusion criteria:

• Healthy infants 6-12 or 11-17 weeks of age at the time of dose 1 whose parent/guardian sign a written informed consent and whose parents/guardians can and will comply with the requirements of the protocol.

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 of immunosuppressants or other immune-modifying drugs since birth.
• Child is unlikely to remain in the study area during 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.
• First or second degree of consanguinity of parents.

Patient-level data for this study will be made available through www.clinicalstudydatarequest.com following the timelines and process described on this site.