Materials and methods: a pilot open observational prospective study of 218 pediatric patients with laboratory-verified COVID-19 diagnosis was performed. The main epidemiological data were analyzed, including the age structure, as well as the features of the clinical course of this disease. The development of COVID-19 pneumonia was recorded in 11,5% of cases (25 patients), while more often pneumonia was recorded in children of the first year of life, as well as over 12 years of age (23,5% and 20% of cases, respectively) than in children of other age groups (p

Routine vaccination against viral hepatitis B (HBV) has significantly reduced morbidity and mortality from this infection. The development of acute HBV in children is currently a rarity, but there is still the possibility of developing a similar scenario in children from family foci of HBV, aswell as in children with no specific prophylaxis. A clinical observation of the development of acute HBV in aninfant is presented, and the difficulties of managing such patients are demonstrated.