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If said person is sick and touches nose/mouth, wearing a mask won't prevent that person from spreading germs. You can still get sick from touching a surface a sick person touched with his germs.i'm not following the part on how if a person touched their nose or mouth before putting on the mask, it would be harmful to others? i also forgot to add the parts such as people not touching any part of their faces and still practice social distancing measures while everybody is wearing a mask. i don't think even a vaccine would be 100% safe.