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Incidence of pathogenic Escherichia coli in acute infantile diarrhea in Dakar


, : Incidence of pathogenic Escherichia coli in acute infantile diarrhea in Dakar. Bulletin de la Societe de Pathologie Exotique et de Ses Filiales 81(2): 202-210

We have studied the incidence of enteropathogenic (EPEC), enteroinvasive (EIEC) and enterotoxigenic (ETEC) Escherichia coli associated with infant acute diarrhoeal disease in Dakar during a period of one year. We report 405 strains of Escherichia coli suspected to be the etiologic agent of the diarrhoea and isolated from 405 diarrheic stools of 0-5 years old children. We have isolated 119 pathogenic Escherichia coli with 63 EPEC (15.5%), 3 ETEC (0.7%) and 53 ETEC (13.1%) including 23 strains releasing heat-labile enterotoxin (LT+) and 30 strains releasing heat-stable enterotoxin (ST+). No ST+/LT+ strain was isolated. Escherichia coli with colonization factor antigens were isolated from 62 children. Almost all of them are CFAI+. Only one strain is CFAII+ and another one agglutinates with both CFAI and CFAII antisera. Among these CFA+ strains 5 belong to the EPEC group, 29 are enterotoxigenic (25 ST+ and 4 LT+) and 28 do not belong to any known etiopathologic group. Near 70% of the pathogenic Escherichia coli are from infants less than one year old, with a highest frequency between 7 and 12 months. Prevalence of ETEC is higher during the raining season. The existence of a great number of strains that belong to none of the 3 groups of etiopathologic Escherichia coli emphasis the need to search other factors of pathogenicity.

US$29.90

PMID: 3046768


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