title: [Interpretation of Ortho HCV Ab ELISA test results by chiron HCV recombinant immunoblot assay].
abstract: HCV infections are diagnosed by determining the circulating antibodies to the C 100 recombinant viral antigen using the ELISA method. Cut-off analysis from normal subjects and well documented NANBH patients suggests that screening of a low risk group such as blood donors might yield a relatively high ratio of false positives. An immunoblot assay (Chiron RIBA) using 3 recombinant antigens, C 100, 5-1-1 and SOD has been developed for evaluating the ELISA reactives as an additional, more specific assay. In the RIBA testing 51.5% were reactive and 28.5% were indeterminate in ELISA positive donor specimens, and 79.5% were reactive and 8.0% were indeterminate in ELISA positive non-A, non-B hepatitis patients specimens. These findings coincide with the ratio of theoretically calculated true positive. In a study done by Ortho U.S.A. viral RNA were detected in 70% of RIBA reactive, 33% of indeterminate and 3.6% non-reactive specimens by polymerase chain reaction (PCR). Furthermore, an advanced system using another immunogenic region of viral polyprotein including c33c encoded in NS3 has been on trial to evaluate the possibility of confirming HCV infection and detecting seroconversion at an earlier stage.
authors.forename: N
authors.initials: N
authors.lastname: Yahagi
authors.forename: K
authors.initials: K
authors.lastname: Kitsugi
mesh_terms: D000956:Antigens, Viral / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D016174:Hepacivirus / Q000276:immunology*; D006508:Hepatitis Antibodies / Q000032:analysis*; D006526:Hepatitis C / Q000175:diagnosis* / Q000276:immunology; D006801:Humans; D015151:Immunoblotting; D011994:Recombinant Proteins / Q000276:immunology*; D017361:Viral Nonstructural Proteins; D014764:Viral Proteins / Q000276:immunology*
chemical_list: D000956:Antigens, Viral; C064544:C100 protein, hepatitis C virus; D006508:Hepatitis Antibodies; D011994:Recombinant Proteins; D017361:Viral Nonstructural Proteins; D014764:Viral Proteins