Surgeons and dentists wear masks to protect the sterile field.
Mainly from coughs etc, not microscopic viral particles that are 100 x smaller than gaps in the fabric.
This whole thing is so fucking retarded.
How do morons wearing masks at the park/beach not see that?
Supposedly, though the mask only reduces the number of viral particles from escaping a cough or sneeze, that it still greatly lowers the amount of the virus that gets into exposed people. And so being exposed to a reduced viral load, increases the odds that their immune system can have a fighting chance, create antibodies and defeat the virus.
I'm still wondering about just how far and for how long the virus can travel in air and stay viable. I suspect far more than what scientists say, especially indoors.