2023
DOI: 10.1101/2023.07.26.23293155
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Impact of Community Masking on SARS-CoV-2 Transmission in Ontario after Adjustment for Differential Testing by Age and Sex

Abstract: Background: Use of masks and respirators for prevention of respiratory infectious disease transmission is not new, but has proven controversial, and even politically polarizing during the SARS-CoV-2 pandemic. In the Canadian province of Ontario, mask mandates were introduced by the 34 regional health authorities in an irregular fashion from June to September 2020, creating a quasi-experiment that can be used to evaluate impact of community mask mandates. Ontario SARS-CoV-2 case counts were strongly biased by t… Show more

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“…Beginning in March 2020, jurisdictions across Canada experienced a variety of measures that could impact the spread of airborne infectious diseases. These measures included lockdowns (1,2), masking (both on a personal and institutional level (3,4), and social distancing (5). While adherence, enforcement and austerity of these measures in Canada differed by province (6), they left a measurable effect on seasonal Influenza.…”
Section: Introductionmentioning
confidence: 99%
“…Beginning in March 2020, jurisdictions across Canada experienced a variety of measures that could impact the spread of airborne infectious diseases. These measures included lockdowns (1,2), masking (both on a personal and institutional level (3,4), and social distancing (5). While adherence, enforcement and austerity of these measures in Canada differed by province (6), they left a measurable effect on seasonal Influenza.…”
Section: Introductionmentioning
confidence: 99%