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Evaluation of the performance of SARS‐CoV‐2 antibody assays for a longitudinal populationbased study of COVID‐19 spread in St. Petersburg, Russia
Author(s) -
Barchuk Anton,
Shirokov Daniil,
Sergeeva Mariia,
Tursunzade Rustam,
Dudkina Olga,
Tychkova Varvara,
Barabanova Lubov,
Skougarevskiy Dmitriy,
Danilenko Daria
Publication year - 2021
Publication title -
journal of medical virology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 121
eISSN - 1096-9071
pISSN - 0146-6615
DOI - 10.1002/jmv.27126
Subject(s) - seroprevalence , antibody , serology , medicine , immunoassay , virology , gold standard (test) , concordance , covid-19 , immunology , population , antibody titer , titer , disease , environmental health , infectious disease (medical specialty)
Geographical variation in severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) spread requires seroprevalence studies based on local tests, but robust validation is needed. We summarize an evaluation of antibody tests used in a serological study of SARS‐CoV‐2 in Saint Petersburg, Russia. We validated three different antibody assays: chemiluminescent microparticle immunoassay (CMIA) Abbott Architect SARS‐CoV‐2 immunoglobulin G (IgG), enzyme linked immunosorbent assay (ELISA) CoronaPass total antibodies test, and ELISA SARS‐CoV‐2‐IgG‐EIA‐BEST. Clinical sensitivity was estimated with the SARS‐CoV‐2 polymerase chain reaction (PCR) test as the gold standard using manufacturer recommended cutoff. Specificity was estimated using prepandemic sera samples. The median time between positive PCR test results and antibody tests was 21 weeks. Measures of concordance were calculated against the microneutralization test (MNA).Sensitivity was equal to 91.1% (95% confidence intervbal [CI]: 78.8–97.5), 90% (95% CI: 76.4–96.4), and 63.1% (95% CI [50.2–74.7]) for ELISA Coronapass, ELISA VectorBest, and CMIA Abbott, respectively. Specificity was equal to 100% for all the tests. Comparison of receiver operating characteristics has shown lower AUC for CMIA Abbott. The cutoff SC/O ratio of 0.28 for CMIA Abbott resulted in a sensitivity of 80% at the same level of specificity. Less than 33% of the participants with positive antibody test results had neutralizing antibodies in titers 1:80 and above. Antibody assays results and MNA correlated moderately. This study encourages the use of local antibody tests and sets the reference for seroprevalence correction. Available tests' sensitivity allows detecting antibodies within the majority of PCR positive individuals. The Abbott assay sensitivity can be improved by incorporating a new cutoff. Manufacturers' test characteristics may introduce bias into the study results.