Health AffairsConclusion

The study provides evidence that states in the US mandating use of face masks in public had a greater decline in daily COVID-19 growth rates after issuing these mandates compared to states that did not issue mandates. These effects are observed conditional on other existing social distancing measures and are independent of the CDC recommendation to wear facial covers issued on April 3. As countries worldwide and states begin to relax social distancing restrictions and considering the high likelihood of a second COVID-19 wave in the fall/winter,30 requiring use of face masks in public might help in reducing COVID-19 spread.

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