Acute diarrhea is one of the most commonly reported illnesses in the United States, second only to respiratory infections. Worldwide, it is a leading cause of mortality in children younger than four years old, especially in the developing world. Diarrhea that lasts less than 2 weeks is termed acute diarrhea. Persistent diarrhea lasts between 2 and 4 weeks. Chronic diarrhea lasts longer than 4 weeks.
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