On the other hand: https://www.sciencedaily.com/releases/2019/09/190903134732.htm https://www.sciencedaily.com/releases/2019/09/190903134732.h... "A study publ

On the other hand: https://www.sciencedaily.com/releases/2019/09/190903134732.htm https://www.sciencedaily.com/releases/2019/09/190903134732.h... "A study published today in JAMA compared the ubiquitous surgical (or medical) mask, which costs about a dime, to a less commonly used respirator called an N95, which costs around $1. The study reported "no significant difference in the effectiveness" of medical masks vs. N95 respirators for prevention of influenza or other viral respiratory illness."