The objective of this study was to assess the prevalence of hepatitis B virus and possible risk factors for this disease in 401 patients infected with the human immunodeficiency virus, followed at the University Hospital of the Ribeirão Preto Medical School, São Paulo State University. Each participant was submitted to a specific questionnaire and had a blood sample tested for the serologic markers HBsAg, total anti-HBcAg, anti-HBsAg and anti-HCV, using ELISA technique. The overall prevalence of hepatitis B markers was 40.9%, with 8.5% for HBsAg, 39.7% for total anti-HBcAg and 5.5% for anti-HBsAg. The variables that showed association with HBV were: age, higher education level, history of jaundice, time spent in prison, having a homosexual partner and positive markers for anti-HCV. Co-infection HBV/HCV was present in 20.4% of the participants.
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