Fig. 2.

Prevalence of significant fibrosis by HIV and chronic hepatitis C virus infection (n=927). Chronic HCV infection was defined by the presence of detectable HCV RNA; HCV uninfected individuals included those who were HCV antibody negative and those who were HCV antibody positive and had undetectable HCV RNA. 231 individuals who were HCV antibody positive but did not have HCV RNA testing were excluded. The presence of liver fibrosis was estimated using the AST to platelet ratio index (APRI).