Figure 1.
Real-time strand-specific quantitative assay for the detection of HCV RNA–negative and –positive strands. Reverse transcription was done at 70° C using thermostable enzyme Tth and the first round of PCR amplification was limited to 20 cycles. The nested round employed LightCycler FastStart DNA Master SYBR Green I (Roche Diagnostics). (A) Detection of negative-strand HCV RNA synthetic template. (B) Detection of positive-strand HCV RNA synthetic template. (C) Specificity of the assay for the detection of negative-strand HCV RNA: reverse transcription was done with positive-sense primer using serial dilution of positive-strand HCV RNA as template. (D) Nonnested real-time PCR detection of HCV RNA–positive strand using MMLV for the reverse transcription step.