The acute gastroenteritis is a problem not only in developing countries but also in Europe. Rotaviruses cause severe disease in the young infant and noroviruses cause milder disease in all age groups. They are responsible for countless outbreaks in hospitals, nurseries, day care centers, hotels and restaurants. Rehydration of infants and neonates can be challenging, but handling of viral gastroenteritis in general is easy. Outbreak management on the other hand can be laborious and time consuming. This report is an overview on pathogenesis, management and epidemiology of the most important viruses causing acute gastroenteritis.