I wear a mask. I encourage all my friends to wear a mask. It's a very low cost, with large potential upside. There's no good reason not to wear a mask. But

I wear a mask. I encourage all my friends to wear a mask. It's a very low cost, with large potential upside. There's no good reason not to wear a mask. But I am also interested in the pure science & am asking strictly from that point of view. Again, I am not suggesting we don't need to wear masks. I found this report on the CDC website that states: "Although mechanistic studies support the potential effect of hand hygiene or face masks, evidence from 14 randomized controlled trials of these measures did not support a substantial effect on transmission of laboratory-confirmed influenza" (emphasis mine) https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article I'm aware it's for influenza & not COVID-19, but most research, including evidence suggesting we should wear masks, is based on research done on influenza. I think it's reasonable, given the paucity of COVID-19 data and we have to do something, and given they're both RNA viruses, experts feel it's reasonable as well. My conclusion from above is that while we should still definitely wears masks, it's unlikely wearing them will see a noticeable change in R0, which is what we need to really open up. I.e., opening with mask compliance probably isn't going to work, and we need people to stay home. I'm not an expert, so would to love to learn if I've got anything wrong. Thanks in advance.