Similarly I downloaded some college level medical textbooks on flu or coronavirus. Most of them from 2010-2018 didn't even have the word mask written in them one single time. Out of 20 I checked only one mentioned masks, pointing that some asian countries tried it. No data on whether it worked or not, just one sentence that some people tried it.
Similarly I downloaded some college level medical textbooks on flu or coronavirus. Most of them from 2010-2018 didn't even have the word mask written in them one single time. Out of 20 I checked only one mentioned masks, pointing that some asian countries tried it. No data on whether it worked or not, just one sentence that some people tried it.