> a much more important study [1], based on 1607 hospital workers found that penetration of cloth masks by particles was almost 97%. Amusingly (or horrifyingly

> a much more important study [1], based on 1607 hospital workers found that penetration of cloth masks by particles was almost 97%. Amusingly (or horrifyingly, if you prefer), I'm fairly sure that's the study that #Masks4All posts were referring to when they claimed that cloth masks are 96% effective. I recognize the 1607 number at least.