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A simplified semiquantitative determination of hepatitis C virus genome molecules by the end-point dilution method.

We describe a semiquantitative method to measure hepatitis C virus (HCV) viral particle numbers, by carrying out reverse-transcription polymerase chain reaction (RT-PCR) on serial dilutions of serum samples. The virus concentrations measured were 10(3)-10(6) viral particles ml-1 of serum. The method described is relatively quick, and the only required manipulation is dilution of the serum. An optimal RT-PCR method is used for diluted and undiluted samples.