Hepatitis C virus (HCV) antibodies were detected in 85.9% of the samples by commercial enzyme immunoassay (EIA) kits. Most EIA-positive samples were reactive (80%) by the RIBA HCV test (Ortho Diagnostics). Samples with optical density values greater than or equal to 2.0 were mostly reactive (87%) by RIBA HCV test, in contrast to those with values less than or equal to 1.0 (6.6%). Samples which were indeterminate by the RIBA HCV test were positive (88.4%) by HCV neutralization EIA (Abbott Laboratories), along with 29.4% of samples which were nonreactive by the RIBA HCV test.
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Chaudhary et al. (1991) studied this question.
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