Northwestern University

390 random PCR testing campaign were conducted in workplaces testing 22,834 individuals, and 48 campaigns in residential areas testing 3, 881 individuals. At least 1 infected individual was found in 72.3% of workplaces and 72.4% of residential areas. There was no evidence for differences in PCR point prevalence between the workplaces and residential areas, consistent with a widely disseminated epidemic. 

PCR positivity in the ad-hoc testing campaigns in workplaces and in residential areas

Raddad L, Chemaitelly H, et al. Characterizing the Qatar Advanced-phase SARS-Sars-CoV-2 Epidemic. 19 July 2020. BioRxiv.  https://doi.org/10.1101/2020.07.16.20155317

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