Factors associated with HCV exposure and persistent HCV viremia in IDUs.

SD, standard deviation; AST, aspartate aminotransferase; ALT, alanine aminotransferase; HBsAg, hepatitis B surface antigen; HCV, hepatitis C virus; HIV, human immunodeficiency virus. aRatio relative to upper normal limit, the unit of AST and ALT is IU/L. bAll anti-HIV-positive subjects were seropositive for HIV RNA.