We know that when people don’t wear masks, outbreaks are more likely.

restaurant, choir practice, camp, spin class...whatever.

All share common control failure - no masks (+ some documented low/no ventilation)
We know what would be different in high-profile outbreaks if masks were worn.

Diamond Princess Cruise Ship

No masks: 712 of the 3,711 passengers

Masks: ~10 would have been infected
We now have evidence that wearing a mask can reduce the severity of disease, even if the wearer is infected.

https://academic.oup.com/cid/advance-article/doi/10.1093/cid/ciaa889/5864495
We know we will have to find ways to live with this until a vaccine is available.

Masks are the "right now" strategy that can help us reopen schools and offices and the economy. https://twitter.com/j_g_allen/status/1317279296143171586?s=20
You can follow @j_g_allen.
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