> If a surgical mask can stop germs from going out of the mouth, then I better hear a more rigorous reason why that same mask doesn't work in the opposite direc

> If a surgical mask can stop germs from going out of the mouth, then I better hear a more rigorous reason why that same mask doesn't work in the opposite direction. One word: leakage. Watch this: Healthcare - Mask vs. Respirator Video - 3M Worker Health and Safety https://www.youtube.com/watch?v=JR2uLfEVD2w https://www.youtube.com/watch?v=JR2uLfEVD2w