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Hepatitis C virus (HCV) strains were isolated from human sera in vitro. NGUK-1 rat neurinoma neural cells [1] were selected as the experimental model of HCV. The cells were infected after attaining the confluence. The virus caused no cytopathic effect during its multiplication. After monolayer infection (24-96 h), culture fluid samples were tested for HCV RNA by classical PCR with electrophoretic...