Abstract

Hepatitis C virus (HCV) is a parenterally transmitted hepatotropic pathogen. HCV infection is a major health problem worldwide, frequently causing cirrhosis and liver cancer. There is no preventive vaccine against HCV and treatment, consisting of interferon alpha plus Ribavirin, is generally effective in less than 50% of cases. HCV has evolved mechanisms for surviving in the host. Infection with multiple different HCV variants, as well as interaction with concurrent pathogens, might be successful strategies for viral persistence. The present review illustrates the current status of HCV co-infection with highly relevant pathogens. Issues regarding tropism, disease progression and antiviral treatment response, among other aspects, are discussed. Data accumulated reveal that HCV co-infection should not be considered the mere sum of several independent infections. Some significant questions are still unanswered. Therefore, nowadays, it might be more reasonable to face HCV co-infections as a new biological, clinical and even predominant epidemiological entity.

Key words: Hepatitis C virus, hepatitis B virus, human immunodeficiency virus, co-infection.