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To determine the influence of concurrent human immunodeficiency virus (HIV) infection on chronic hepatitis B virus (HBV) infection, 150 male homosexual chronic hepatitis B surface antigen (HBsAg) carriers were studied. Of these, 82 subjects (55%) tested positive for antibodies to HIV. They were more likely to express hepatitis B “e” antigen (HBeAg) (P < .001) and HBV-DNA (P < .0005) in serum than were HIV-seronegative individuals. However, the degree of immune suppression did not influence HBeAg-HBV-DNA expression. In HBeAg-seropositive subjects, concurrent HIV infection was associated with lower serum alanine transferase levels (P < .001). This effect increased with the degree of immune suppression as determined by CD4+ lymphocyte counts. Conversely, in patients negative for HBeAg, there was a weak trend towards higher alanine transferase levels with concurrent HIV. This study suggests …