Its totally fine to recommend masks & to note strengths & limits w data
But let's not go overboard and claim a cluster RCT was impossible. It certainly was possible in March. @mgtmccartney
Here is what is wrong with this op-ed: [thread]https://www.nytimes.com/2020/11/06/opinion/sunday/coronavirus-masks.html?smid=tw-share …
Hospital data? Yes but that’s confounded by PPE effects. The thing we really want to get at, for which we have much less clinical data, is source control. That said, as I wrote, when you have a well-established mechanism and lab studies, those are just as evidence.
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Im not sure what you mean by PPE effects — PPE (aside from masks) used only for care of known COVID patients, who are usually minimally infectious by that point, 7+ days into illness. Hospital transmission was mostly occurring from pre/asymptomatically infected staff and patients
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numerous substantial hospital outbreaks reported when masks and PPE were used for covid patients, but without universal masking
. Since universal masking, virtually none except in cases of breakdowns, shared eating spaces, etc
https://www.krisp.org.za/news.php?id=421 - Show replies
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