After Brigham and Women's Hospital in Boston began requiring that nearly everyone in the hospital wear masks, new coronavirus infections diagnosed in its staffers dropped by half — or more:https://wbur.fm/2XZXteM
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Replying to @WBUR @chipgoines
@zeynep here's some more evidence on the effectiveness of masks for you1 reply 0 retweets 0 likes


8:21 AM - 23 Apr 2020
0 replies
0 retweets
1 like
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