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I guess the masks have more of a psychological effect. People wearing masks feel reassured. Perhaps because they know that the people around them are less likely to infect them if they are sick.
As for protection, it's proved that cleaning your hands regularly and avoiding to touch your visage, eyes, noses etc. with your hand when outside is more efficient.
I also really like the "I'm Immune" T-shirt. These are a must.
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