As I mentioned to the other person, the first study I cited states: > There is limited evidence for their effectiveness in preventing influenza virus transmiss

As I mentioned to the other person, the first study I cited states: > There is limited evidence for their effectiveness in preventing influenza virus transmission either when worn by the infected person for source control or when worn by uninfected persons to reduce exposure. The later study also states non-N95 masks allow 97%. So basically useless.