Comparison of two immunoassays for concurrent detection of HCV antigen and antibodies among HIV/HCV co-infected patients in dried serum/plasma spots
| Autor: | Amare Eshetu, Norbert Bannert, Andrea Hauser, Daniel Schmidt, Martin Obermeier, Barbara Bartmeyer, Viviane Bremer, Alexander Volkwein, Claus-Thomas Bock, Robert Ehret |
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| Rok vydání: | 2020 |
| Předmět: |
Adult
Male 0301 basic medicine Serial dilution Hepatitis C virus 030106 microbiology HIV Infections Hepacivirus Window period medicine.disease_cause Sensitivity and Specificity Plasma 03 medical and health sciences Western blot Antigen Virology medicine Humans Seroconversion Immunoassay biology medicine.diagnostic_test Spots Hepatitis C Antibodies Middle Aged Hepatitis C digestive system diseases 030104 developmental biology biology.protein Reagent Kits Diagnostic Hepatitis C Antigens Antibody |
| Zdroj: | Journal of Virological Methods. 279:113839 |
| ISSN: | 0166-0934 |
| DOI: | 10.1016/j.jviromet.2020.113839 |
| Popis: | Hepatitis C virus (HCV) antigen/antibody (Ag/Ab) assays offer the benefit of reducing the window period compared to assays that detect only HCV-Ab. In this study the performance of the Murex Ag/Ab (Murex, Abbott) and Monolisa Ag/Ab Ultra (Monolisa, Bio-Rad) ELISAs was compared for the use of filter dried serum/plasma spots (DS/PS) with a focus on the sensitivity and the percentage of correct positive test results. Correct positive ELISA results were assumed for samples that subsequently tested positive for HCV RNA by RT-qPCR, or RNA negative samples that tested positive in a Western blot (confirmed ELISA results). Sensitivity was evaluated from DS/PS eluates using HCV seroconversion panels [plasma samples of subtypes-(St) 1a, 2b)] and longitudinal HCV antibody positive serum panels (St 1b, 2b, 3a, and 4d). The proportion of correct positive test results was evaluated using 1102 newly diagnosed HIV positive clinical dried serum spots (DSS) eluates for screening of potential HCV co-infection. For the plasma HCV seroconversion samples, which were used as a reference for DSS eluates, the Murex became reactive earlier for antigen positive bleeds. However, for the HCV antibody positive eluates and dilutions thereof, the Monolisa demonstrated a superior sensitivity. Of the clinical DSS 22.8 % (28/123) of samples reactive in the Murex were negative in a subsequent RT-qPCR and Western blot, while only 1.9 % (2/105) of the samples reactive in the Monolisa were negative in these confirmatory assays. Our results indicate that the Monolisa provides fewer false positive results for HCV detection in DSS, whereas for undiluted plasma or serum samples, the Murex can serve as an additional diagnostic tool to narrow the window period. |
| Databáze: | OpenAIRE |
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