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This may be a rumor but it really does seem to work for me as a preventative measure. I heard somewhere in my travels that one of the ways colds and flu infect is via the tear ducts. For years I've made a habit of not rubbing my eyes (which is REALLY difficult around 2 AM) and if I need to, use a paper towel or wash my hands first. My wife's flu came and went these last two weeks, all her friends are falling one by one, and I'm still not showing symtoms (knock-knock.)