Observational Study
. 2020 Dec;20(12):1401-1408. doi: 10.1016/S1473-3099(20)30589-2. Epub 2020 Aug 3. Risk of COVID-19 in health-care workers in Denmark: an observational cohort study Henning Bundgaard 2 , Rasmus B Hasselbalch 3 , Jonas H Kristensen 3 , Pernille B Nielsen 3 , Mia Pries-Heje 2 , Andreas D Knudsen 4 , Casper E Christensen 5 , Kamille Fogh 3 , Jakob B Norsk 3 , Ove Andersen 6 , Thea K Fischer 7 , Claus Antonio Juul Jensen 8 , Margit Larsen 9 , Christian Torp-Pedersen 7 , Jørgen Rungby 10 , Sisse B Ditlev 11 , Ida Hageman 12 , Rasmus Møgelvang 2 , Christoffer E Hother 9 , Mikkel Gybel-Brask 9 , Erik Sørensen 9 , Lene Harritshøj 9 , Fredrik Folke 13 , Curt Sten 14 , Thomas Benfield 15 , Susanne Dam Nielsen 16 , Henrik Ullum 9Affiliations
AffiliationsItem in Clipboard
Observational Study
Risk of COVID-19 in health-care workers in Denmark: an observational cohort studyKasper Iversen et al. Lancet Infect Dis. 2020 Dec.
. 2020 Dec;20(12):1401-1408. doi: 10.1016/S1473-3099(20)30589-2. Epub 2020 Aug 3. Authors Kasper Iversen 1 , Henning Bundgaard 2 , Rasmus B Hasselbalch 3 , Jonas H Kristensen 3 , Pernille B Nielsen 3 , Mia Pries-Heje 2 , Andreas D Knudsen 4 , Casper E Christensen 5 , Kamille Fogh 3 , Jakob B Norsk 3 , Ove Andersen 6 , Thea K Fischer 7 , Claus Antonio Juul Jensen 8 , Margit Larsen 9 , Christian Torp-Pedersen 7 , Jørgen Rungby 10 , Sisse B Ditlev 11 , Ida Hageman 12 , Rasmus Møgelvang 2 , Christoffer E Hother 9 , Mikkel Gybel-Brask 9 , Erik Sørensen 9 , Lene Harritshøj 9 , Fredrik Folke 13 , Curt Sten 14 , Thomas Benfield 15 , Susanne Dam Nielsen 16 , Henrik Ullum 9 AffiliationsItem in Clipboard
Erratum in[No authors listed] [No authors listed] Lancet Infect Dis. 2020 Oct;20(10):e250. doi: 10.1016/S1473-3099(20)30652-6. Epub 2020 Aug 14. Lancet Infect Dis. 2020. PMID: 32805199 Free PMC article. No abstract available.
Background: Health-care workers are thought to be highly exposed to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. We aimed to investigate the prevalence of antibodies against SARS-CoV-2 in health-care workers and the proportion of seroconverted health-care workers with previous symptoms of COVID-19.
Methods: In this observational cohort study, screening was offered to health-care workers in the Capital Region of Denmark, including medical, nursing, and other students who were associated with hospitals in the region. Screening included point-of-care tests for IgM and IgG antibodies against SARS-CoV-2. Test results and participant characteristics were recorded. Results were compared with findings in blood donors in the Capital Region in the study period.
Findings: Between April 15 and April 23, 2020, we screened 29 295 health-care workers, of whom 28 792 (98·28%) provided their test results. We identified 1163 (4·04% [95% CI 3·82-4·27]) seropositive health-care workers. Seroprevalence was higher in health-care workers than in blood donors (142 [3·04%] of 4672; risk ratio [RR] 1·33 [95% CI 1·12-1·58]; p<0·001). Seroprevalence was higher in male health-care workers (331 [5·45%] of 6077) than in female health-care workers (832 [3·66%] of 22 715; RR 1·49 [1·31-1·68]; p<0·001). Frontline health-care workers working in hospitals had a significantly higher seroprevalence (779 [4·55%] of 16 356) than health-care workers in other settings (384 [3·29%] of 11 657; RR 1·38 [1·22-1·56]; p<0·001). Health-care workers working on dedicated COVID-19 wards (95 [7·19%] of 1321) had a significantly higher seroprevalence than other frontline health-care workers working in hospitals (696 [4·35%] of 15 983; RR 1·65 [1·34-2·03]; p<0·001). 622 [53·5%] of 1163 seropositive participants reported symptoms attributable to SARS-CoV-2. Loss of taste or smell was the symptom that was most strongly associated with seropositivity (377 [32·39%] of 1164 participants with this symptom were seropositive vs 786 [2·84%] of 27 628 without this symptom; RR 11·38 [10·22-12·68]). The study is registered at ClinicalTrials.gov, NCT04346186.
Interpretation: The prevalence of health-care workers with antibodies against SARS-CoV-2 was low but higher than in blood donors. The risk of SARS-CoV-2 infection in health-care workers was related to exposure to infected patients. More than half of seropositive health-care workers reported symptoms attributable to COVID-19.
Funding: Lundbeck Foundation.
Copyright © 2020 Elsevier Ltd. All rights reserved.
FiguresFigure 1
Seroprevalence according to job assignment…
Figure 1
Seroprevalence according to job assignment compared with blood donors Purple indicates blood donors…
Figure 1Seroprevalence according to job assignment compared with blood donors Purple indicates blood donors serving as a proxy for the general population (n=4672). Blue indicates health-care workers not working on dedicated COVID-19 wards or frontline (n=11 488). Red indicates frontline health-care workers not working on dedicated COVID-19 wards (n=15 983). Green indicates health-care workers working on dedicated COVID-19 wards (n=1321). NS=not significant.
Figure 2
Seroprevalence stratified according to specialty…
Figure 2
Seroprevalence stratified according to specialty for doctors, nurses, and assisting nurses Figure shows…
Figure 2Seroprevalence stratified according to specialty for doctors, nurses, and assisting nurses Figure shows specialties with at least 100 participants.
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