Delta infection in eastern Sicily.

Sera from 619 HBsAg+ subjects living in eastern Sicily, consecutively collected from 1975-1985, were tested for markers of delta virus (HDV) infection: delta antigen (HDAg), antibodies to delta (anti-HDIg), and also for antibodies to HBcore of IgM type (anti-HBcIgM) and for the system HBe-anti-HBe. The subjects included 210 asymptomatic carriers, 238 patients with acute hepatitis and 171 patients with chronic liver disease. HDAg was not found in any of the samples. Anti-HD was found in 28/171 (16.3%) patients with chronic liver disease, in 13/210 (6%) asymptomatic HBsAg carriers and in 13/238 (5.4%) patients with acute hepatitis. None of our patients were drug addicts. One had a history of blood transfusion, and nine came from the same family unit. The prevalence of HDV infection in eastern Sicily is lower than in other areas of Sicily possibly because of the lower percentage of HBsAg carriers in the local population. Parenteral transmission of HDV does not seem to play a major role in our area, while the familial clustering suggests close body contact as an important way of spread.