Droplets are not aerosol. Contact means actual touching, transferring by contact with hands to face primarily.
https://time.com/5794729/coronavirus-face-masks/ highlights CDC (and other health authorities) recommend healthy people NOT wear masks
Health Experts Are Telling Healthy People Not to Wear Face Masks for Coronavirus. So Why Are So Many Doing It?
By Mandy Oaklander
March 4, 2020
As the new coronavirus COVID-19 spreads in the U.S., people who are well want to stay that way. But since no vaccines are currently available, the strongest weapons Americans have are basic preventive measures like hand-washing and sanitizing surfaces, according to the Centers for Disease Control and Prevention (CDC).
The simplicity of those recommendations is likely unsettling to people anxious to do more to protect themselves, so it’s no surprise that face masks are in short supply—despite the CDC specifically not recommending them for healthy people trying to protect against COVID-19. “It seems kind of intuitively obvious that if you put something—whether it’s a scarf or a mask—in front of your nose and mouth, that will filter out some of these viruses that are floating around out there,” says Dr. William Schaffner, professor of medicine in the division of infectious diseases at Vanderbilt University. The only problem: that’s not effective against respiratory illnesses like the flu and COVID-19. If it were, “the CDC would have recommended it years ago,” he says. “It doesn’t, because it makes science-based recommendations.”
Masks are good for medical personnel but even there the CDC has relaxed guidelines.
Although masks help contain the virus within infected people wearing a mask, those infected people should NOT be out and about.
The science, according to the CDC, says that surgical masks won’t stop the wearer from inhaling small airborne particles, which can cause infection. Nor do these masks form a snug seal around the face.
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