Hey medical folks like Ray Bob and all, do these surgical masks prevent you from breathing in a virus OR prevent you from breathing out a virus and spreading it?
It helps with droplet / aerosol spray mainly, not inspired air. Remember it’s traditionally been worn by the person attempting to contain THEIR germs (the sick person or medical staff) but somewhere along the way the Asian community thought it kept them from getting sick. Meanwhile, in airports all across the country, we dodged them thinking they were infectious once they donned the mask.
It will surely help you keep aerosol particles out of your airway if you’re around sick people coughing, sneezing or even talking. It’s also important to remember that many of these cultures will pack as many humans as possible into public modes of transport where strangers are literally breathing/sneezing/coughing ON you.
If you’re sick, it absolutely helps so we should all wear one or better yet..... stay home.