A toxin(s) has been demonstrated in the stools of two patients with antibiotic- associated colitis. This toxin(s) was heat-labile, wasrapidly lethal for hamsters, increased vascular permeability in rabbit skin, and was cytotoxic for cells in tissue-culture. It was neutralised by Clostridium sordellii antitoxin but not by antitoxins prepared against otherclostridia; Escherichia coli, and Vibrio cholerœ toxins. These characteristics were identical to those of a toxin implicated in the ætiology of antibiotic-induced colitis in the hamster. One patient improved rapidly after treatment with oral vancomycin, and at the same time the toxin disappeared from the stool.
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