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Improved detection of hepatitis C virus antibodies in high-risk populations
J G McHutchison1, J L Person, S Govindarajan
1Division of Gastrointestinal and Liver Diseases, University of Southern California School of Medicine, Los Angeles 90033.
Insights
Second-generation hepatitis C antibody tests show improved sensitivity over first-generation assays, particularly in high-risk patients. The recombinant immunoblot assay further refines detection by identifying specific viral antigens.
Area of Science:
- Hepatology
- Immunology
- Virology
Background:
- Hepatitis C virus (HCV) infection diagnosis relies on serological assays.
- First-generation assays (e.g., c100-3) have limitations in sensitivity and specificity.
- Advancements include second-generation enzyme-linked immunosorbent assays (ELISAs) and recombinant immunoblot assays (RIBA) incorporating additional viral antigens.
Purpose of the Study:
- To evaluate the diagnostic performance of first- and second-generation ELISAs and a four-antigen RIBA for detecting hepatitis C antibodies.
- To compare assay sensitivity in patient groups with high and low risk of HCV exposure.
Main Methods:
- Sera from 483 patients (313 high-risk, 170 low-risk) were tested.
- Assays used: first-generation ELISA (c100-3), second-generation ELISA (including NS3/NS4 and nucleocapsid antigens), and four-antigen RIBA.
- Comparison of sensitivity and concordance between the different test systems.
Main Results:
- Second-generation ELISA showed higher sensitivity (55% in high-risk, 32% in low-risk) than first-generation ELISA (45% and 26%).
- RIBA detected antibodies in 46% (high-risk) and 7% (low-risk) of patients.
- High concordance between first- and second-generation ELISAs (99%), with second-generation ELISA detecting additional reactive sera.
Conclusions:
- Second-generation ELISA offers improved sensitivity for hepatitis C antibody detection compared to first-generation assays.
- RIBA provides further confirmation and antigen-specific information, especially in high-risk populations.
- Combined use of advanced serological assays enhances hepatitis C diagnosis accuracy.
Abstract:
Sera from 483 patients at high (group 1, n = 313) and lower (group 2, n = 170) risk for exposure to hepatitis C were tested for antibodies to hepatitis C using first-generation (c100-3) and second-generation enzyme-linked immunosorbent assays and four-antigen recombinant immunoblot assay. The second-generation enzyme-linked immunosorbent assay and nitrocellulose-based immunoblot assay differ from c100-3-based systems in the addition of expression products from the NS3/NS4 (c33c, c200) and putative nucleocapsid (c22-3) region of the hepatitis C genome. In group 1, the sensitivity of detection of hepatitis C antibodies was 45%, 55% and 46% by the first- and second-generation enzyme-linked immunosorbent assays and recombinant immunoblot assay, respectively. In group 2, antibodies were detected by each test system in 26%, 32% and 7% of patients, respectively. Most sera (99%) reactive with the first-generation enzyme-linked immunosorbent assay were reactive with the second-generation enzyme-linked immunosorbent assay (in group 1, 89% of these specimens demonstrated reactivity to at least one antigen with the immunoblot assay, compared with only 31% in group 2). An additional 12% (group 1) and 6% (group 2) of specimens demonstrated reactivity with the second-generation enzyme-linked immunosorbent assay only (of these, 75% [group 1] and 9% [group 2] demonstrated reactivity to at least one antigen with the immunoblot assay). Ninety-eight percent of specimens not reactive with both enzyme-linked immunosorbent assay test systems were also nonreactive by recombinant immunoblot assay.(ABSTRACT TRUNCATED AT 250 WORDS)