a bacterial species found in feces of humans and animals. It colonizes newborn infants, who are spared from toxin-induced diarrheal disease. Pathogenic for human beings, guinea pigs, and rabbits; frequent cause of colitis and diarrhea following antibiotic use. Found to be a cause of pseudomembranous colitis and associated with a number of intestinal diseases that are linked to antibiotic therapy; also the chief cause of nosocomial diarrhea.
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Examples: glitazone, GI cocktail, etc.