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A Comparative Study of Enterotoxigenic Escherichia coli, shigella, aeromonas, and Vibrio as Etiologies of Diarrhea in Northeastern Thailand^*

Peter Echeverria, Jitvimol Seriwatana, David N. Taylor, Samreung Yanggratoke^** AND Chalard Tirapat^***

Armed Forces Research Institute of Medical Sciences
^** Soongnern Hospital, Soongnern, Nakornrajsima, Thailand
^*** the Faculty of Public Health, Mahidol University, Bangkok, Thailand

The incidence of enterotoxigenic Escherichia coli (ETEC), Shigella, Aeromonas, and Vibrio was determined in patients with diarrhea seen at a hospital in northeastern Thailand, and compared with the incidence of these bacteria in household contacts and their neighbors. ETEC was identified in 17%, Shigella in 9%, Aeromonas in 9%, V. parahaemolyticus in 5%, and non-01 V. cholerae in 2% of 299 patients with diarrhea. These five species of bacteria were isolated more often from patients with diarrhea than persons without diarrhea (P < 0.001). ETEC was found more often in household contacts (22/141) and neighbors (18/147) of index cases than in persons living in homes not associated with ETEC infections (32/1,318; P < 0.001). While Shigella was isolated less often in family contacts (3/76) and neighbors (4/93) of patients with shigellosis, this enteric pathogen was also isolated more often from contacts than persons not associated with Shigella infection (13/1,437; P < 0.001). Both Aeromonas and non-01 V. cholerae can also be enteric pathogens; further efforts should be made to define the enteropathogenicity of these bacteria.

Accepted for publication November 16, 1984.

^* Address reprint requests to: P. Echeverria, M.D., AFRIMS, APO San Francisco, CA 96346-5000; or Rajvithi Road, Bangkok 10400, Thailand.

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