Your dismissive tone is uncalled for and not appreciated. Here's a systematic review that cites several studies that find face masks show a statistically signif

Your dismissive tone is uncalled for and not appreciated. Here's a systematic review that cites several studies that find face masks show a statistically significant effect in protection against influenza: https://www.bmj.com/content/339/bmj.b3675.short https://www.bmj.com/content/339/bmj.b3675.short If your collaborators can point you to peer-reviewed studies that rebut these results, or to a serious current analysis that shows the impossibility (or estimates the price and time frame) of ramping up PPE production, please post it.