The histopathology of rectosigmoid biopsies from 20 patients with bloody diarrhea resulting from verotoxin-producing Escherichia coli infection is reported. The biopsies displayed a range of appearances, from normal to mild, nonspecific inflammation to acute infectious-type colitis. Surface-adherent or invasive bacteria were not identified. The morphologic features of infectious colitis and the absence of bacteria suggest that verotoxin may be responsible for the pathologic changes.
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Kelly et al. (1987) studied this question.
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