I think it’s because there is more than one “port of entry” for a virus. You can touch the virus with your ungloved hand (on a door knob for example) and then rub your eye and bam! you have a virus. Once you are infected, wearing the mask over your virus spewing mouth and nose makes it less likely that the virus is going to be on the door knob in the first place. Those flimsy paper masks don’t seem like the best protection either way.
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