Rates of acute gastroenteritis caused by rotavirus and other agents among age-eligible infants will be compared for infants (vaccinated and unvaccinated) from villages randomized to receive Rotarix versus for those (unvaccinated) from villages randomized not to receive Rotarix. We expect that the rates of diarrhoea will be significantly lower among children from the vaccinated villages, but that rates of diarrhoea caused by other pathogens may be similar. (This second analysis - a "control analysis" - will be helpful to verify a lack of bias in health seeking behaviours since one would expect that cholera, ETEC, Salmonella and Shigella gastroenteritis rates would be similar in the two groups.). These cases will be detected from all patients of all ages who come to the Matlab Diarrhoeal Hospital or the community treatment centres (Nayergaon or Kalirbazaar), but the primary analysis will include only those rotavirus diarrhoea cases among children who had been age-eligible for vaccination in their respective villages.