NEW: CDC guidance on masks expected to change in next 10 days. Americans will be advised to wear masks in everyday life. Current recommendation is for high-risk groups only.
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(Also it's not true that they don't prevent catching the illness; they *do* lower odds, all masks do. Many, many studies. Just in differing degrees; any less odds is better but again key reason is asymptomatic transmission. This isn't SARS.)
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We can think like the enemy running into us without anything between us, and the enemy running into us from the door of the room.
End of conversation
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