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If you're in a bar or restaurant, or other confined space and some one ore a few people are flooding the air with viruses, wearing a mask protects you minimally.  The problem is, there are A1 receptors in most mucus membranes.  The mucus membranes in your eye lids can give the virus entry into your body, which is why you see professional responders wearing full face guards.    Feeling young and healthy? Fine as long as the virus doesn't somehow get past your upper respiratory system.  If it dose you are in deep doo doo, no matter how young and healty you are because the virus can mount  many different attacts in the bodies many different tissues.  Otherwise you simply become a spreader.  I don't think many young people really want to be killers.  But, the price of making serious mistakes can be really unacceptable to the one who does it.  It's called regret.  Don't become a regretter.   Stay safe!