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What prevents #COVID19 spread?
And to what extent?
An exceptional systematic analysis of 172 global studies in ~26,000 people (not randomized trials)
—Physical distancing > 1 m; & more the better
—Masks (N95 > surgical/cotton)
—Eye protection
thelancet.com/journals/lance… @TheLancet
Accompanying editorial "the best specific evidence for #COVID19 prevention"
@KirbyInstitute's MacIntyre and Wang @UNSW
Unfortunately, both @WHO & @CDCgov have given very poor guidance for both the #healthcare workforce and the public on masks (and have not emphasized eye protection to date)
+ coverage @nytimes by @apoorva_nyc nytimes.com/2020/06/01/hea…
Good infographic summary of the large body of data reviewed
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