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Testing profiles for two anti-HCV-negative, HCV RNA-positive participants. These 2 participants represent the only subjects for whom false-negative anti-HCV tests were found among 559 HIV-positive and 944 HIV-negative persons. The arrow and shaded area represent the time of testing for anti-HCV and HCV RNA in this study. ∗, results obtained with the COBAS system; ALT, alanine aminotransferase.
