Diarrhea is a common symptom of various medical conditions. It involves having loose, watery stools three or more times per day. Acute, or short-term, diarrhea usually lasts for a couple of days.

HOUSTON—(Embargoed until 6:30p.m. EST June 11, 2008)— Researchers at The University of Texas School of Public Health have found that patients given a travelers' diarrhea vaccine were significantly ...