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Shiga toxin-producing Escherichia coli in Montana: bacterial genotypes and clinical profiles

Jill K Jelacic1, Todd Damrow, Gilbert S Chen

  • 1University of Washington School of Medicine, Seattle, Washington, USA.

The Journal of Infectious Diseases
|August 23, 2003
PubMed

Insights

Shiga toxin-producing Escherichia coli (STEC) strains vary in virulence genes. Non-O157:H7 STEC are more diverse and less frequently cause bloody diarrhea compared to E. coli O157:H7.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Genetics

Background:

  • Shiga toxin-producing Escherichia coli (STEC) infections pose significant public health risks.
  • Incomplete characterization of STEC virulence factors and associated diseases hinders effective management.
  • Understanding genetic diversity is crucial for predicting STEC pathogenicity.

Purpose of the Study:

  • To analyze the genetic profiles of STEC isolates.
  • To correlate specific virulence genes with clinical manifestations of STEC infections.
  • To differentiate between E. coli O157:H7 and non-O157:H7 STEC pathogenicity.

Main Methods:

  • Prospective collection of 82 STEC isolates from Montana.
  • Polymerase chain reaction (PCR) for detecting virulence genes (stx1, stx2, eae, iha, espA, ehxA).
  • Patient chart review to profile associated illnesses and clinical outcomes.

Main Results:

  • All E. coli O157:H7 isolates possessed stx2-group, eae, iha, espA, and ehxA genes; 84% also had stx1.
  • Non-O157:H7 STEC isolates showed less frequent carriage of stx1, stx2, iha, eae, and espA.
  • Non-O157:H7 STEC were less often isolated from emergency department patients and tended to cause less bloody diarrhea.

Conclusions:

  • Non-O157:H7 STEC are genetically more heterogeneous than E. coli O157:H7.
  • The presence of specific Shiga toxin genotypes does not solely determine the occurrence of bloody diarrhea.
  • Clinical outcomes of STEC infections are influenced by a complex interplay of bacterial genetics and host factors.

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