One minute you're fine, and the next you begin to sweat as crippling cramps move wavelike through your belly. You vomit or havediarrhea, or both, fearing you won't live to see another day; then it goes away. You're back to your old self, maybe after a day or two.The Centers for Disease Control and Prevention estimates that this scenario, known as an ?acute gastrointestinal event,? happens to all of us at least ...

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