The paper presents the results of virological, serological, and epidemiological examinations of patients with acute enteric infections of obscure etiology carried out for detection of rotavirus gastroenteritides. Rotaviruses have been found to play a certain role in generating acute gastroenteritides in infants under 3 years, mostly among infants, of 1-2 years, the least among those of 0-6 months of age. Adult family members were the source of infection for the children. The season of infection falls on October-December.