Although a higher prevalence of HIV/HCV coinfection was observed in individuals of >40 year of age (OR: 1.04, 95% CI: 1.00–1.09), HIV-positives having CD4+ T cell counts of >200 cells/μL were associated with lowered risk of coinfection with HCV (OR: 0.19, 95% CI: 0.06–0.52) (Table 3), suggesting that age and CD4+ T cell count may affect the risk for HIV/HCV coinfection. This evidence concerns the gene CD4 and coinfection.