Face masks for COVID pass their largest test yet – “A rigorous study finds that surgical masks are highly protective, but cloth masks fall short”.

Face masks for COVID pass their largest test yet – Nature

Original study: [Preprint] Largest study of masks yet details their importance in fighting Covid-19.

Commentary on Twitter

Face masks for COVID pass their largest test yet – I & others comment. It is true that I bought pink surgical masks (my favorite color) in response to this study for when I am around unvaccinated adults (or indoor public spaces for now)https://t.co/nFhlcqwrjv

— Monica Gandhi MD, MPH (@MonicaGandhi9) September 9, 2021