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Hepatitis A virus infections in Voyvodina

SUMMARY Sera of 1000 persons in Voyvodina were tested with radioimmunoassay for antibodies against hepatitis A virus (HAV). The morbidity and age incidence of positive findings have been analysed and compared with relevant findings in other countries. Below the age of 19 years the morbidity rates are higher (0·138 to 0·595 per mill) and the prevalences of seropositives are lower (17·1–64·0%) than the respective frequencies above that age (0·011 to 0·052 per mill and 85·7–98·7 % respectively). Below the first year of life seropositivity is more frequent than in 1- to 14-year old children. After the first year until the age of 30–39 years the frequency of seropositives increases with increasing age up to a maximum of about 90%.