Introduction: The replication of Hepatitis B (HBV) and C (HCV) virus and the immune response involved in the mechanism of hepatic lesion in viral hepatitis remains unknown.Case report: The authors present a 34 year-old male patient, an intravenous drug addict in abstinence for 5 years, with Hepatitis C diagnosed for a year, genotype 3a. In December 2004 he had acute hepatitis B with stage 4 encephalopathy and a...