colonbacillus
co·lon bacillus (kōʹlən) n.
A rod-shaped bacterium, especially Escherichia coli, a normal, generally nonpathogenic commensal found in all vertebrate intestinal tracts, but which can be virulent, causing diarrhea and other dysenteric symptoms. Its presence in water is an indicator of fecal contamination.

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Universalium. 2010.

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