A 57-yr-old woman with chronic diarrhea, mild azotemia, and red cell casts in her urine was found to have pseudomembranous colitis. She had not received antimicrobial agents for at least 2 yr. Membranoproliferative glomerulonephritis was found on kidney biopsy, and her renal function improved spontaneously. Pseudomembranous colitis was diagnosed by endoscopic biopsy. Her stool contained a cytopathic toxin that was neutralized by Clostridium sordellii antitoxin, and Clostridium difficile was cultured on selective media. This case indicates that C. difficile may be a cause of nonantibiotic-associated pseudomembranous colitis, as well as antibiotic-associated pseudomembranous colitis.
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