This is the most misquoted study of the pandemic (almost). High risk medical setting: only tested protection, not source control, used most useless cloth mask ever tested, and no 'no mask' arm, since it was deemed unethical.
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Can you please be clear. Do cloth masks/ face coverings stop the wearer from catching COVID-19?
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Can you also be clear? Do you mean 100% effective? If so, I'm not sure anything other than total and complete isolation is 100% effective.
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