SARS-CoV-2 seroprevalence in healthcare workers of a Swiss tertiary care centre at the end of the first wave: a cross-sectional study.

Details

Ressource 1Download: article publié BMJ Open_06.07.21e049232.full.pdf (455.50 [Ko])
State: Public
Version: Final published version
License: CC BY-NC 4.0
Serval ID
serval:BIB_471F833F0211
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
SARS-CoV-2 seroprevalence in healthcare workers of a Swiss tertiary care centre at the end of the first wave: a cross-sectional study.
Journal
BMJ open
Author(s)
Meylan S., Dafni U., Lamoth F., Tsourti Z., Lobritz M.A., Regina J., Bressin P., Senn L., Grandbastien B., Andre C., Fenwick C., D'Acremont V., Croxatto A., Guilleret I., Greub G., Manuel O., Calandra T., Pantaleo G., Lazor-Blanchet C.
Working group(s)
COVID-19 MISS group
Contributor(s)
Peters O., Currat M., Posset L., Fares F., Soumas V., Bignon S., Corne E., Currat M., Quelhas JDS, Dussex A., Ker D., Mosset P., Moulin E., Prouvost E., Ruscio K., Piccon S., Valterio F., Allain E., Guay C., Hezari Z., Levet Y., Posset L., Prevost M.A., Rognon A., Salehi-Gysel H., Starck C., Tornier A., da Fonseca S.T., Udriot A.
ISSN
2044-6055 (Electronic)
ISSN-L
2044-6055
Publication state
Published
Issued date
05/07/2021
Peer-reviewed
Oui
Volume
11
Number
7
Pages
e049232
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: epublish
Abstract
To assess the SARS-CoV-2 transmission in healthcare workers (HCWs) using seroprevalence as a surrogate marker of infection in our tertiary care centre according to exposure.
Seroprevalence cross-sectional study.
Single centre at the end of the first COVID-19 wave in Lausanne, Switzerland.
1874 of 4074 responders randomly selected (46% response rate), stratified by work category among the 13 474 (13.9%) HCWs.
Evaluation of SARS-CoV-2 serostatus paired with a questionnaire of SARS-CoV-2 acquisition risk factors internal and external to the workplace.
The overall SARS-CoV-2 seroprevalence rate among HCWs was 10.0% (95% CI 8.7% to 11.5%). HCWs with daily patient contact did not experience increased rates of seropositivity relative to those without (10.3% vs 9.6%, respectively, p=0.64). HCWs with direct contact with patients with COVID-19 or working in COVID-19 units did not experience increased seropositivity rates relative to their counterparts (10.4% vs 9.8%, p=0.69 and 10.6% vs 9.9%, p=0.69, respectively). However, specific locations of contact with patients irrespective of COVID-19 status-in patient rooms or reception areas-did correlate with increased rates of seropositivity (11.9% vs 7.5%, p=0.019 and 14.3% vs 9.2%, p=0.025, respectively). In contrast, HCWs with a suspected or proven SARS-CoV-2-infected household contact had significantly higher seropositivity rates than those without such contacts (19.0% vs 8.7%, p<0.001 and 42.1% vs 9.4%, p<0.001, respectively). Finally, consistent use of a mask on public transportation correlated with decreased seroprevalence (5.3% for mask users vs 11.2% for intermittent or no mask use, p=0.030).
The overall seroprevalence was 10% without significant differences in seroprevalence between HCWs exposed to patients with COVID-19 and HCWs not exposed. This suggests that, once fully in place, protective measures limited SARS-CoV-2 occupational acquisition within the hospital environment. SARS-CoV-2 seroconversion among HCWs was associated primarily with community risk factors, particularly household transmission.
Keywords
COVID-19, Cross-Sectional Studies, Health Personnel, Humans, SARS-CoV-2, Seroepidemiologic Studies, Switzerland/epidemiology, Tertiary Care Centers, epidemiology, infection control, occupational & industrial medicine, preventive medicine, virology
Pubmed
Web of science
Open Access
Yes
Create date
09/07/2021 17:29
Last modification date
11/09/2021 6:39
Usage data