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Enteroaggregative and cell-detaching Escherichia coli strains among Polish children with and without diarrhea

B M Sobieszczańska1, J Osek

  • 1Department of Microbiology, University of Medicine, 50-368 Wrocław, Poland. mapasobie@provider.pl

Folia Microbiologica
|April 3, 2004
PubMed

Insights

This study found no direct link between enteroaggregative (EAEC) and cell-detaching (CDEC) E. coli and childhood diarrhea in Poland. However, differences in EAEC and CDEC strains were observed between sick and healthy children.

Area of Science:

  • Microbiology
  • Pediatrics
  • Infectious Diseases

Background:

  • Enteroaggregative (EAEC) and cell-detaching (CDEC) Escherichia coli are potential enteric pathogens.
  • Diarrhea in children remains a significant health concern, particularly in regions with unknown etiologies.

Purpose of the Study:

  • To investigate the association of EAEC and CDEC E. coli with diarrhea of unknown origin in children from Wrocław, Poland.
  • To characterize the virulence factors, such as hemolysin production and cytotoxic necrotizing factor 1 (CNF1), in isolated E. coli strains.

Main Methods:

  • E. coli strains were isolated from stool specimens of children with diarrhea and age-matched healthy controls.
  • Mannose-resistant adherence to HEp-2 cells was assessed to identify EAEC and CDEC.
  • Hemolysin production and CNF1 synthesis were determined for CDEC strains.

Main Results:

  • EAEC were found in 26% of children with diarrhea and 20% of controls; CDEC in 36% of diarrhea cases and 35% of controls.
  • Cell-detaching activity was associated with hemolysin production.
  • CNF1 synthesis was more prevalent in hemolytic CDEC strains from children with diarrhea (57%) compared to controls (14.3%).

Conclusions:

  • Neither EAEC nor CDEC E. coli strains showed a significant association with childhood diarrhea in this study population.
  • Despite the lack of direct association, distinct differences were noted in EAEC and CDEC strains isolated from children with and without diarrhea, suggesting potential roles or variations in virulence.

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