[An analysis of the seasonal rise in hepatitis A morbidity at a children's center and ways to improve the sanitary epidemiologic surveillance for this infection among organized preschoolers].

The spread of hepatitis A in children's institution occurred through everyday contacts, the boundaries of the focus of infection embraced the whole institution, and the active detection of the prevailing subclinical forms of the disease proved to be possible by means of virological and biomedical tests. The enhancement of the effectiveness of clinical and epidemiological surveillance by its orientation to the control of the spread of this infection through water and everyday contacts, the rational organization of sanitary, microbiological and serological studies, the development of criteria of epidemiological safety of children's institutions is proposed.