During 1984-1989, 655 diarrheic and 287 nondiarrheic stool specimens from adult U.S. citizens living in Lima, Peru were tested for presence of bacterial enteropathogens. Frequencies of isolation among diarrheic specimens were: Shigella 9.8%; Campylobacter 6.1%; enterotoxigenic Escherichia coli (ETEC) 6.0%; Plesiomonas 2.0%; Salmonella 1.4%; and Vibrio 0.6%. Isolates recovered from non-diarrheic stools were: Shigella 4.5%; Campylobacter 2.1%; Salmonella 1.0%; ETEC 0.7%; Plesiomonas 0.7%; and Vibrio 0.3%. Aeromonas, an unproven cause of diarrhea, was isolated from 9.2% of cases and 3.5% of controls. Disease occurrence was strongly associated with isolation of Shigella, ETEC, Campylobacter, or Aeromonas (p less than or equal to 0.01). During the 6-year period of study, shifts in the dominant phenotypes of Shigella and Campylobacter occurred which may have important implications for vaccine development and intervention strategies.
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