1/3 US officials initially told us not to bother wearing #facemasks in #COVID19 epidemic b/c of low effectiveness. 'There's a model for that' is the new 'there's an app for that.' Let's look.

2/3 80% adoption of moderately (50%) effective masks could prevent 17–45% of projected deaths over two months in NY, decreasing peak daily death rate 34–58%. Even crappy masks (20% effective) can help: In Washington, 80% adoption could reduce
mortality 24–65%, peak deaths 15–69%)

3/3 In NY, this alone would --> 2–9% mortality reduction, 9-18% peak death reduction. Are you still not wearing a facemask b/c 'they're not effective'? From https://www.medrxiv.org/content/10.1101/2020.04.06.20055624v1