covid
Masks and respirators do not work. There have been extensive randomized controlled trial (RCT) studies, and meta-analysis reviews of RCT...
https://open.lbry.com/@thecrowhouse:2/cornholer-virus-creating-the-second-wave:2?r=EJwBGioZwF9wkNwkdUkn72P3AfgudLAJ