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Gastroenteritis is an intraluminal inflammation of the gastrointestinal (GI) tract that involves any region from the stomach to the colon. Infectious gastroenteritis may be caused by bacteria, viruses, parasites, or preformed toxins produced by bacteria. Viral causes are the most common.

Complete a thorough history to help determine the possible etiology, assess the severity of dehydration, and rule out other serious illnesses that can appear with vomiting and/or diarrhea at presentation. Determine the character of the vomiting and/or diarrhea, including the duration of symptoms, number of episodes, and presence of bile or blood in the vomitus or of blood or...

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