The aim of the present study was to define and characterize the occurrence of a hepatitis outbreak. A hepatitis outbreak developed from November 1987 and June 1988 in a peripheral district of the city of Granada. Sixty cases were diagnosed (59 confirmed and 1 probable). An increase in the incidence was observed during October, November and December. There were no sex differences in the specific attack rates and the mean age of cases was 7.14 years; the specific rates in the different age groups were higher in the 0-5 years and 6-10 years groups. The most common symptoms and signs were choluria, abdominal pain and jaundice. Anti-HVA IgM was positive in 83.3% of cases. Only 5 children required hospital admission, and the outcome of 83.3% of cases was known and favorable. The strategies adopted against the outbreak were to recommend hygienic measures in the households and school where cases had developed and to give nonspecific human immunoglobulins before or after exposure in the closed contacts of cases. We do not feel that these strategies have had a sizeable effect on the course of the outbreak.