Study of 2 Doses of Oral Live Attenuated Human Rotavirus (HRV) Vaccine for the Prophylaxis of Rotavirus Gastroenteritis

Inclusion Criteria: * A male or female between, and including, 6 and 12 weeks (42-90 days) 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 physical examination, before entering into the study. * Subjects for whom the vaccination history is available from vaccination diary cards or medical charts or patient diary cards. 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. * Planned administration of a vaccine (including routine paediatric vaccines) not foreseen by the study protocol during the period starting from 14 days before each dose of study vaccine(s) and ending 14 days after. * Any clinically significant history of chronic gastrointestinal (GI) disease including any uncorrected congenital malformation of the GI tract or other serious medical condition, as determined by the investigator. * History of allergic disease or reactions likely to be exacerbated by any component of the vaccine. * Any confirmed or suspected immunosuppressive or immunodeficient condition based on medical history and physical examination (no laboratory testing is required). * Major congenital defects or serious chronic illnesses such as malignant disease (e.g. melanotic neuroectodermal tumor, malignant rhabdoid tumor, etc.), serious atopic dermatitis, conditions that are the result of premature birth, etc. * Acute disease at time of enrolment. (Acute disease is defined as the presence of moderate or severe illness with or without fever i.e. temperature \>= 37.5°C as measured by an axillary thermometer or \>= 38.0°C as measured by a rectal thermometer. A temperature greater than or equal to these cut-offs warrants deferral of the vaccination pending recovery of the subject.) * GE within 7 days preceding the study vaccine administration (warrants deferral of the vaccination). * Administration of immunoglobulins and/or blood products since birth or planned administration during the study period. Oral intake of immunoglobulins via, e.g., breastfeeding is allowed. * 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.) * Previous confirmed occurrence of RV GE. * Household contact with an immunosuppressed individual