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Antibodies to SARS-CoV-2 protect against re-infection during outbreaks in care homes, September and October 2020
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View Affiliations Hide AffiliationsAnna Jeffery-Smithanna.jefferysmith phe.gov.uk
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Citation style for this article: . Antibodies to SARS-CoV-2 protect against re-infection during outbreaks in care homes, September and October 2020. Euro Surveill. 2021;26(5):pii=2100092. https://doi.org/10.2807/1560-7917.ES.2021.26.5.2100092 Received: 23 Jan 2021; Accepted: 04 Feb 2021
Abstract
Two London care homes experienced a second COVID-19 outbreak, with 29/209 (13.9%) SARS-CoV-2 RT-PCR-positive cases (16/103 residents, 13/106 staff). In those with prior SARS-CoV-2 exposure, 1/88 (1.1%) individuals (antibody positive: 87; RT-PCR-positive: 1) became PCR-positive compared with 22/73 (30.1%) with confirmed seronegative status. After four months protection offered by prior infection against re-infection was 96.2% (95% confidence interval (CI): 72.7–99.5%) using risk ratios from comparison of proportions and 96.1% (95% CI: 78.8–99.3%) using a penalised logistic regression model.
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