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- Shelly Bolotin, Vanessa Tran, Selma Osman, Kevin A Brown, Sarah A Buchan, Eugene Joh, Shelley L Deeks, and Vanessa G Allen.
- Public Health Ontario, Toronto, Ontario, Canada.
- J. Infect. Dis. 2021 Apr 23; 223 (8): 1334-1338.
AbstractWe analyzed 21 676 residual specimens from Ontario, Canada collected March-August 2020 to investigate the effect of antibody decline on SARS-CoV-2 seroprevalence estimates. Testing specimens orthogonally using Abbott (anti-nucleocapsid) and Ortho (anti-spike) assays, seroprevalence estimates were 0.4%-1.4%, despite ongoing disease activity. The geometric mean concentration (GMC) of antibody-positive specimens decreased over time (P = .015), and GMC of antibody-negative specimens increased over time (P = .0018). Association between the 2 tests decreased each month (P < .001), suggesting anti-nucleocapsid antibody decline. Lowering Abbott antibody index cutoff from 1.4 to 0.7 resulted in a 16% increase in positive specimens.© Her Majesty the Queen in Right of Canada, as represented by Ontario Agency for Health Protection and Promotion, 2021.
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