Abstract
In the study presented here the ribavirin mutagenic effect was investigated by analyzing quasispecies in the viral 5' untranslated region of hepatitis C virus in six patients with chronic infection who started interpheron-alpha and ribavirin therapy. A remarkable mutation rate during treatment was found in only one individual. This patient had a sustained response and harbored a type 3a virus strain. The different mutated clones in this patient demonstrated no apparent close relationship that could suggest lack of selection pressure by ribavirin. The mutations were located within the loops of subdomains IIIb and IIId of the internal ribosomal entry site. This is an interesting initial finding that needs to be substantiated in a larger trial.
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