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e relatively low number of officially reported cases, noroviruses are undoubtedly one of the most important causes of gastroenteritis in this country. Further studies are therefore necessary to expand the body of knowledge of their ecology and circulation. The article presents the results of a study of family clusters of COVID-19 whose aim was to describe the clinical course of the disease in children, to identify secondary transmission in households with infected children, and to find out the differences in the antibody response between children and adults