2/"After the governor’s executive order, COVID-19 incidence decreased (mean decrease of 0.08 cases per 100,000 per day; net decrease of 6%) among counties with a mask mandate but continued to increase (mean increase of 0.11 cases per 100,000 per day; net increase of 100%)..."
3/"...among counties without a mask mandate (nonmandated counties)."
4/"The decrease in cases among mandated counties and the continued increase in cases in nonmandated counties adds to the evidence supporting the importance of wearing masks and implementing policies requiring their use to mitigate the spread of SARS-CoV-2." @SecNorman
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2/Important: "Masks also help reduce inhalation of these droplets by the wearer (“filtration for personal protection”)."
Previous data focused on reducing spread by an infected person (i.e., 'source control').
3/How?
"Studies demonstrate that cloth mask materials can also reduce wearers’ exposure to infectious droplets through filtration, including filtration of fine droplets and particles less than 10 microns."