Again, the study will be conducted in both the government comparison area and the intervention area of Matlab HDSS. Enrolment will begin in the government comparison area no later than June 1, 2008. Enrolment will begin in the intervention area January 1, 2009. Surveillance for rotavirus diarrhoea will occur continuously and concurrently to enrolment activities. Enrolment in both areas will cease on June 30, 2010, but surveillance for rotavirus gastroenteritis will occur until December 31, 2010.