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Definition: ABBR: E. coli.. A gram-negative bacillus in the human colon. These small, plump, bacilli are normally nonpathogenic in the intestinal tract, but some serotypes may cause diarrheal illnesses, urinary tract infections, sepsis, or hemolytic uremic syndrome. Certain enterotoxigenic strains are a principal cause of travelers’ diarrhea.
Source: Taber's Cyclopedic Medical Dictionary. Philadelphia: F.A.Davis Company, 2009. Credo Reference. Web. 10 August 2012.