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A log-log plot of hepatitis B virus DNA concentrations in 66 samples as measured by real-time-polymerase chain reaction and HC2 assay. Strong correlation (r = 0.915) was observed between results obtained with the two assays for the 40 concordant positive samples. A total of 26 samples tested negative by HC2 assay, but 20 of these had detectable hepatitis B virus DNA by real-time-PCR, while six samples had undetectable DNA by both the assay
