It's far from perfect, but I believe this to be the best RCT we have on masks out of Bangladesh: https://www.science.org/doi/10.1126/science.abi9069 https://www

It's far from perfect, but I believe this to be the best RCT we have on masks out of Bangladesh: https://www.science.org/doi/10.1126/science.abi9069 https://www.science.org/doi/10.1126/science.abi9069 We found clear evidence that surgical masks are effective in reducing symptomatic seroprevalence of SARS-CoV-2. Although cloth masks clearly reduce symptoms, we find less clear evidence of their impact on symptomatic SARS-CoV-2 infections, with the statistical significance depending on whether we impute missing values for nonconsenting adults. I don't believe we have any good studies out of the US or Europe. There's a discussion about this and more on the Econ Talk podcast this week: https://www.econtalk.org/vinay-prasad-on-the-pandemic/ https://www.econtalk.org/vinay-prasad-on-the-pandemic/