Volume 29, Issue 4
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



The etiology of diarrhea in children and adults on the Navajo Indian Reservation was investigated in August 1975. Fifty-six ill individuals and 37 controls were included in the study. was most commonly associated with diarrhea, and was isolated from 32% of ill children and adults. Fifty percent of isolates tested were resistant to ampicillin. Heat-stable enterotoxin-(ST)-producing organisms were associated with noninflammatory diarrhea in adults (27% of these cases had ST-producing strains) but not in children. Heat-labile enterotoxin-producing organisms were found among controls as well as individuals with diarrhea. No children had evidence of rotavirus infection. These findings suggest that ST-producing organisms are important causes of sporadic cases of noninflammatory summer diarrhea among Navajo adults and confirm the importance of in inflammatory diarrhea among adults and children in this setting.


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