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To evaluate the enteropathogenicity of Aeromonas hydrophila and Plesiomonas shigelloides, the rate of isolation of these organisms was compared among individuals with and without diarrhea in Thailand. In two groups of American travelers, A. hydrophila, but not P. shigelloides, was associated with episodes of travelers diarrhea more often than when individuals did not have diarrhea (P less than 0.025). Among three populations of Thais, A. hydrophila and P. shigelloides were isolated with similar frequencies from individuals with and without diarrhea. The biochemical characteristics, production of cytotoxin, and ability to distend suckling mouse intestine were similar among A. hydrophila isolates from individuals with and without diarrhea. However, cytotoxic A. hydrophila strains distended rabbit and suckling mouse intestine and produced destructive lesions in intestinal mucosa of both species of animal. P. shigelloides strains produced neither cytotoxin nor distended intestine. Oral administration of whole cultures (10(9)) of cytotoxic A. hydrophila or P. shigelloides failed to cause diarrhea in rhesus monkeys. Volunteer studies or intestinal biopsies of patients with diarrhea may be required to establish whether A. hydrophila is a gastrointestinal pathogen in humans.
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