학술논문
SARS-CoV-2 risk in household contacts of healthcare workers: a prospective cohort study.
Document Type
Article
Author
Kohler, Philipp; Dörr, Tamara; Friedl, Andrée; Stocker, Reto; Vuichard, Danielle; Kuster, Stefan P.; Kahlert, Christian R.; the SURPRISE Study Group; Besold, Ulrike; Betschon, Elsbeth; Brucher, Angela; Cusini, Alexia; Goppel, Stephan; Grässli, Fabian; Keller, Joelle; Kessler, Simone; Leal, Onicio; Lemmenmeier, Eva; McGeer, Allison; Kleeb, Dorette Meier
Source
Subject
*MEDICAL personnel
*SARS-CoV-2
*COVID-19
*HOUSEHOLDS
*COHORT analysis
*
*
*
*
Language
ISSN
2047-2994
Abstract
Background: Few studies have assessed whether the increased SARS-CoV-2 risk of healthcare workers (HCW) is carried on to their household contacts. Within a prospective HCW cohort, we assessed the SARS-CoV-2 risk of household contacts of HCW depending on the HCWs cumulative exposure to COVID-19 patients and identified factors influencing this association. Methods: HCW aged ≥ 16 years from nine Swiss healthcare networks participated. HCW without any household contacts were excluded. For HCW, cumulative patient exposure (number of COVID-19 patient contacts times average contact duration during a 12-month follow-up) was calculated. During follow-up, HCW reported SARS-CoV-2 nasopharyngeal swab results and positive swab results of their household contacts. We used multivariable logistic regression to identify variables associated with SARS-CoV-2 household positivity. Results: Of 2406 HCW, 466 (19%) reported ≥ 1 SARS-CoV-2 positive household. In multivariable analysis, patient exposure of HCW (adjusted OR [aOR] 1.08 per category, 95% CI 1.04–1.12), household size (aOR 1.53 per household member, 95% CI 1.35–1.73) and having children (aOR 0.70, 95% CI 0.53–0.94) remained associated with household positivity. Vaccinated HCW had a lower risk (aOR 0.54, 95% CI 0.38–0.77) of reporting a positive contact, as were those using respirator masks in contact with COVID-19 patients (aOR 0.65, 95% CI 0.49–0.86). Among vaccinated HCW, delayed first vaccination was associated with increased household SARS-CoV-2 positivity (aOR 1.14 per month, 95% CI 1.08–1.21). Conclusions: SARS-CoV-2 positivity in household contacts of HCW increases with higher cumulative COVID-19 patient exposure of HCWs. Measures reducing the SARS-CoV-2 risk in HCW might indirectly reduce the infection risk of their households. [ABSTRACT FROM AUTHOR]