Is it true that masks only work to prevent germs/diseases from exiting one’s mouth/nose and not from entering one’s mouth/nose? If so, why?
In: Other
No, it is not. Masks are not directional. However! They seem to be *more effective* when they are stopping the wearer from spreading germs. The reason being; people in general can’t get Ill if the germs aren’t out there in the first place.
Masks can’t get all the germs, in either direction. But they severely limit the number of germs getting past. If you’re stopping them at the source (the cough) very few spread away from there and are much more easily “diluted”.
But if you happen to walk into a cloud of germs and breath in… you’re already in a cloud of germs. Most wont get through; but some will. And, that’s where you’re breathing. By definition.
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