Mask wearing, by those already infected, may help limit the spread. Mask wearing by those uninfected is likely to aid spread as the virus can sit on the mask, which becomes moistened by breath and concentrates the virus making it more likely that an uninfected mask wearer will become infected.
That explains why the medical staff so often wear masks.
Wanting to keep their own germs to themselves.
Reality is it also encourages you not to touch your own face using hands that are far, far more likely to pick up stuff harmful to you from surfaces and other people.
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