Reyne B., Selinger Christian, Sofonea M. T., Miot S., Pisoni A., Tuaillon E., Bousquet J., Blain H., Alizon S. (2021). Analysing different exposures identifies that wearing masks and establishing COVID-19 areas reduce secondary-attack risk in aged-care facilities. International Journal of Epidemiology, 50 (6), p. 1788-1794. ISSN 0300-5771.
Titre du document
Analysing different exposures identifies that wearing masks and establishing COVID-19 areas reduce secondary-attack risk in aged-care facilities
Reyne B., Selinger Christian, Sofonea M. T., Miot S., Pisoni A., Tuaillon E., Bousquet J., Blain H., Alizon S.
Source
International Journal of Epidemiology, 2021,
50 (6), p. 1788-1794 ISSN 0300-5771
Background: The COVID-19 epidemic has spread rapidly within aged-care facilities (ACFs), where the infection-fatality ratio is high. It is therefore urgent to evaluate the efficiency of infection prevention and control (IPC) measures in reducing SARS-CoV-2 transmission. Methods: We analysed the COVID-19 outbreaks that took place between March and May 2020 in 12 ACFs using reverse transcription-polymerase chain reaction (RT-PCR) and serological tests for SARS-CoV-2 infection. Using maximum-likelihood approaches and generalized linear mixed models, we analysed the proportion of infected residents in ACFs and identified covariates associated with the proportion of infected residents. Results: The secondary-attack risk was estimated at 4.1%, suggesting a high efficiency of the IPC measures implemented in the region. Mask wearing and the establishment of COVID-19 zones for infected residents were the two main covariates associated with lower secondary-attack risks. Conclusions: Wearing masks and isolating potentially infected residents appear to be associated with a more limited spread of SARS-CoV-2 in ACFs.
