I've repeatedly had that study linked to me when I say stuff like this. Quote from your link: > Direct Epidemiological Evidence. > Overall, evidence from RCTs

I've repeatedly had that study linked to me when I say stuff like this. Quote from your link: > Direct Epidemiological Evidence. > Overall, evidence from RCTs and observational studies is informative, but not compelling on its own. Both the Australian influenza RCT and the Beijing households observational trial found around 80% efficacy among compliant subjects, and the one SARS household study of sufficient power found 70% efficacy for protecting the wearer. However, we do not know whether the results from influenza or SARS will correspond to results for SARS-CoV-2, and the single observational study of SARS-CoV-2 might not be replicated in other communities. None of the studies looked specifically at cloth masks.