Wash hands, a Lot: Enforcing good general hygeine, particularly hand washing, is probably the best way to prevent transmission of viral illess. Other basic measures include avoiding sharing glassware and utensils, toothbrushes, and even avoiding sharing sleeping space with a sick person. Trying to keep everyone healthy includes good nutrition, adequate exercise and sleep habits (yes 7-8 hours for the teenagers, too.
Answered 9/20/2013
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