Portrait of COVID-19 Outbreaks in the Workplaces of the Monteregie Region.

OBJECTIVES:The aims of the studies are to describe COVID-19 outbreaks in the workplaces of the Monteregie Region, Quebec, Canada, and to evaluate potential risk factors for identifying at least one COVID-19 outbreak in these workplaces. METHODS:An ecological retrospective cohort study was conducted using deidentified databases of COVID-19 outbreaks that occurred in workplaces from February 27, 2020, to June 30, 2021. RESULTS:Among 30,489 workplaces studied, 897 workplaces with at least one COVID-19 outbreak were identified. These outbreaks were associated with a sizeable number of workers in the workplace (adjusted odds ratio [aOR] = 6.78; 95% CI: 5.43-8.47), the presence of temporary foreign workers (aOR = 2.26; 95% CI: 1.53-3.33), contacts with clients (aOR = 1.93; 95% CI: 1.68-2.21), and being localized in the Montreal Metropolitan Area (aOR = 1.26; 95% CI: 1.09-1.45). CONCLUSIONS:These results enable the identification of potential risk factors for COVID-19 outbreaks in workplaces, with the aim of targeting workplaces where infection control and prevention measures might be enhanced or adapted to improve workers' health.