Rotavirus is the primary causative agent of acute gastro-enteritis, especially in children less than 2 years old. Its discovery in 1973 and its association with infantile gastro-enteritis represented a very important advance in the study of gastro-enteritis not caused by acute bacterial infection. Rotavirus is transmitted by oral-faecal contact with an incubation period of 1-3 days etc. In the case of hospitalised children with acute enteritis, up to 50 % of the samples examined are rotavirus positive