Every year 20 million Americans spend at least one horrendous night on the bathroom floor battling nausea, vomiting and diarrhea. Call it what you want--food poisoning or the stomach flu--but your sickness may have been caused by the norovirus. For 1 in every 15 Americans this is true. Knowing how norovirus spreads and how you can avoid it can prevent anymore lonely nights spent with your head in the toilet.read more