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Stool samples were obtained for 14 consecutive days from 62 United States students in Mexico.
Of these 27 became ill with diarrhea and 35 remained well during the period of observation.
Salmonella and Shigella were not cultured in any case.
Enteropathogenic E. coli, Klebsiella and Paracolobactrum could not be incriminated as the cause of the diarrhea of travelers to Mexico.
Instituto de Salubridad y Enfermedades Tropicales, Mexico, D. F.
Departments of Medicine and Public Health and Preventive Medicine, The New York Hospital-Cornell Medical Center, New York.
Medical Student of the National Foundation.