Abstract
The incidence and transmission of hepatitis A in the Swedish child population was investigated for the period 1979–83. 47% (152/323) of the hepatitis A cases in children reported in Sweden 1979–83 occurred in children born to parents of foreign extraction. The annual incidence in Swedish children was extremely low (2/100000) during this period, whereas the incidence was between 103 and 20 in children born to immigrants of Turkish, Jugoslavian, Asian or African extraction. A known transmission of hepatitis A to Swedish children occurred mainly from 3 sources; (1) in 60 cases (35%) by exposure within the families; in 18 of these cases a family member had been abroad, visiting a country where hepatitis A is endemic; (2) in 34 cases (20%) by exposure in a pre-school setting; and (3) in 29 cases (17%) by exposure when travelling abroad. In 48 cases (28%) the exposure was unknown.