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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Cloth masks resulted in more infections than both medical masks and the control group (standard practice).pic.twitter.com/i7gT9QUv9e
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Yes standard practice is medical masks. Of course cloth masks are worse than *medical* masks. Read your tweet again.
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