The quasispecies nature of hepatitis C virus was investigated in a patient with chronic hepatitis C virus infection who underwent interferon-α therapy. The hepatitis C virus E2/NS1 region was amplified and cloned, and multiple clones were sequenced before and after interferon-α therapy. The hepatitis C virus quasispecies can be grouped into three groups by phylogenetic tree analysis. Quasispecies from all the groups were present before interferon-α therapy. However, only group 3 remained after interferon-α therapy. In addition, only group 3 hepatitis C virus quasispecies were present during the early biochemical relapse. These data indicate that various groups of hepatitis C virus quasispecies may have different sensitivity to interferon-α.
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