COVID-19 rapid evidence profile #4: What are the most effective non-medical masks for preventing community transmission of COVID-19, and should they be required for all of society?

Abstract

An overview of the best available research evidence from around the world (i.e., evidence syntheses) and local research evidence (i.e., single studies) and may include a scan of experiences from other countries and from Canadian provinces and territories, about the most effective non-medical masks for preventing community transmission of COVID-19, and if they should be required for all of society in response to a decision-maker’s request.