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Most probably this is just a mild viral gastroenteritis, what some people call "stomach flu" although it has nothing to do with flu. It usually passes on its own in 24-48 hours, although some cases can last as long as 5-6 days. It's important to eat lightly (toast, applesauce, boiled potatoes or white rice) and stay well hydrated with water or an electrolyte fluid such as Gatorade if one has vomiting and diarrhea.
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