[Chronic hepatitis C and risk for hepatitis A infection].
The aim of this study was to determine the prevalence of anti-HAV antibodies and factors associated with HAV infection amongst patients with chronic hepatitis C. The prevalence of anti-HAV antibodies in hepatitis C patients was 69.2% and did not differ significantly from 63.3% observed in the group of healthy controls. In patients with chronic hepatitis C the occurrence of HAV antibodies was not associated with the duration of HCV infection, history of transfusions and surgeries. There was a tendency towards higher prevalence of anti-HAV in persons with history of numerous hospitalizations (60.8% of persons with the history of up to 5 hospitalizations were positive for anti-HAV and more than 84.6% of those with more than 5 hospitalizations). Only 38.5% of patients under 35 years had anti-HAV antibodies. In conclusion immunization against hepatitis A should be recommended for hepatitis C patients under 35 years of age, most of whom are not immune to HAV. Testing for anti-HAV prior to vaccination should be performed in individuals older than 35 because natural immunity is common.