For health care workers, cloth masks *increase* risk of infection compared to no mask in a randomized controlled trial. @zeynep ? https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4420971 …
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I don’t want to gainsay you, but there were three conditions: medical masks, cloth masks & ‘standard procedures', which (sometimes) includes masks. Cloth masks had the most ILI infections.pic.twitter.com/I5O2IBKKSd
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NOT COMPARED TO NO MASKS. Of course cloth masks are not better than medical masks, and they are more prone to infections etc. especially in medical settings. I don't think I can keep repeating this.
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