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I just saw Dr. Oz on the news and he said the masks are useless in preventing entry by the virus. He said the only thing it does is to keep you from touching your face (as much) and transmitting the virus from your hands.

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I have seen that posted also. I would like to see studies. You would think if it is airborne and someone sneezes, those projectile droplets containing virus would be more easily hit the mouth without a mask. Maybe the virus goes through the mask, yes, but does that always mean 100% with one layer of protective barrier as it would without a mask? I think it would have some difference, even if minimal.