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The hepatitis C virus and human immunodeficiency virus share the same transmission routes, which makes co-infection an unfavorable condition for the natural history of both viral diseases. In this context, it should be highlighted that the knowledge of the extent of co-infection and associated risk factors is a vital tool for prevention and control over infectious diseases. The aim of this study was to review the literature, seeking to examine the prevalence of human immunodeficiency virus/hepatitis C virus co-infection reported in studies conducted in Brazil, and identify the main risk factors associated with co-infection. The electronic search was conducted in the Medline, Lilacs and SciELO databases. The following keywords were used: human immunodeficiency virus and Hepatitis C or hepatitis C virus and Brazil. The search led to 376 articles, of which 69 were selected for data extraction. We excluded animal studies, reports or case series, review articles, letters to the editor, other types of hepatitis and those studies in which co-infected patients were intentionally selected for comparison to single infected individuals. As a result, 40 articles were reviewed. The majority of the population in these studies was male (71%) and young adults, with a mean age of 26.7 years. The prevalence of hepatitis C virus co-infection among individuals living with human immunodeficiency virus in the studies conducted in Brazil ranged from 3.3% (serum samples) to 82.4% (drug users), with an average of 20.3%. The findings reveal that the prevalence of human immunodeficiency virus/hepatitis C virus co-infection is highly variable, depending on the characteristics of the study population. Risk factors associated with human immunodeficiency virus/hepatitis C virus co-infection were injection drug use and blood transfusion.

Prevalence of human immunodeficiency virus/hepatitis C virus co-infection in Brazil and associated factors: a review