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Two-year study of endemic enteric pathogens associated with acute diarrhea in New Caledonia.

Eneteric Pathogens Laboratory, Institut Pasteur de Nouvelle-Calédonie, Noumea.

ABSTRACT

A longitudinal study of diarrheal disease among patients of all ages with acute diarrhea was carried out in New Caledonia from January 1990 to December 1991. Stool samples from 2,088 diarrheal patients were examined for parasites, rotavirus, and bacterial pathogens. Potential sources of contamination (drinking water, seawater and bovine and porcine feces) were investigated. One or more enteric pathogens were identified in 41.8 and 40.6% of the persons with diarrhea, in 1990 and 1991, respectively. Salmonella spp., Shigella spp., HEp-2 cell adherent Escherichia coli (diffuse adherent and enteroaggregative), enteropathogenic E. coli (EPEC) (EPEC adherence factor-positive strains belonging to classical serotypes), localized adherent E. coli (non-EPEC), and enterotoxigenic E. coli were the frequently identified enteropathogenic bacteria. Other major enteropathogens were Entamoeba histolytica and Giardia lamblia. Campylobacter jejuni, Clostridium difficile, Clostridium perfringens, Yersinia enterocolitica, and rotavirus were isolated from only a few patients. No Vibrio spp., Aeromonas spp., Plesiomonas spp., Shiga-like-toxin-producing E. coli, enterohemorrhagic E. coli, or enteroinvasive E. coli were identified. Shiga-like toxin I-producing E. coli were present in adult bovines and calves, and heat-stable enterotoxin II-producing enterotoxigenic E. coli were found in pigs.

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