Updated guidelines from the Centres for Disease Control (CDC) in the United States stress that cloth face masks help protect wearers from SARS-CoV-2, as well as shielding others. Previously, protecting surrounding people was seen as the main role of masks. Multi-layer cloth masks are highly effective.
Aside from growing evidence of the effectiveness of masks in reducing COVID-19, the guidelines say: “An economic analysis using US data found that, given these effects, increasing universal masking by 15% could prevent the need for lockdowns and reduce associated losses of up to $1 trillion or about 5% of gross domestic product.”
Below are the updated guidelines published by the CDC on 10 November 2020…..more