Rotavirus (RV) gastroenteritis (GE) was defined as an episode of any severity GE leading to a medical intervention occurring at least two weeks after dose 2 in which rotavirus other than vaccine strain is identified in a stool sample collected as soon as possible but preferably not later than 7 days after the start of the episode.

An SAE is any untoward medical occurrence that: results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is a congenital anomaly/birth defect in the offspring of a study subject, or may evolve into one of the outcomes listed above.

Number of subjects in the Placebo Group with rotavirus vaccine strain in at least one stool sample.

Severe RV GE is an episode of severe GE in which rotavirus other than vaccine strain was identified in a GE stool sample. Note that this outcome measure is secondary in the study protocol. We have reported it here as primary outcome measure, since none of the primary outcome measures in the study protocol pertain to the time point (Year 3 follow-up) presented in this summary.

Number of subjects presenting with three or more looser than normal stools or watery stools within a day, occurring after administration of dose 1 of study vaccine in which rotavirus other than vaccine strain was identified in a stool sample with a score ≥ 11 on the 20-point Vesikari scoring system.

Seroconversion was defined as the appearance of anti-RV IgA antibody concentrations greater than or equal to (≥) 20 units per milliliter (U/mL) in subjects initially (i.e. prior to the first dose of Rotarix™ vaccine or placebo) seronegative, when administered concomitantly with the second and third routine EPI immunization. This outcome measure only concerns subjects in the Placebo-Rotarix-Rotarix Group.

Symptoms reported in the table include: Fever: temperature (axillary route) \> 38.0 degree Celsius (°C); Diarrhea: ≥ 4 looser than normal stools/day; Vomiting: ≥ 2 episodes of vomiting/day.