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)."
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."