High rate of spontaneous clearance of acute hepatitis C virus genotype 3 infection

Treating acute hepatitis C with interferon alpha prevents chronicity in nearly all cases when therapy is initiated within 3 months after infection. However, 15–50% of untreated patients may clear the hepatitis C virus (HCV) spontaneously. Therefore, factors are needed to identify patients prior to therapy who have a higher or lower risk for developing a chronic course to avoid unnecessary treatment. The role of the HCV genotype for spontaneous recovery from acute hepatitis C has been discussed controversially. In the year 2002, all 1,176 new incoming prisoners in a Northern German prison for young men (age 16–24) were screened for anti‐HCV antibodies and 92 tested positive. Ninety eight percent of these reported i.v.‐drug abuse for a median of 32 months prior to imprisonment. HCV‐RNA negative individuals (21%) were serotyped and HCV‐RNA positive patients were genotyped. The prevalence of HCV genotype 3 was significantly higher among individuals who had cleared HCV spontaneously as compared to chronically infected patients (86% vs. 38%; P = 0.002). Ninety three percent of individuals exposed to HCV genotype 1 but only 63% of individuals exposed to genotype 3 experienced a chronic course of the infection (P = 0.006). Thus, acute infection in young Caucasian men with HCV genotype 3 leads more often to spontaneous clearance than infection with HCV genotype‐1. Considering also the high chance of successful treatment of chronic HCV genotype 3 infection with pegylated‐interferon in combination with ribavirin, we suggest not to treat acute hepatitis C genotype 3 infection early but rather to wait at least 3 months after the onset of symptoms when chronicity becomes likely. J. Med. Virol. 73:387–391, 2004. © 2004 Wiley‐Liss, Inc.