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Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid receptor...
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Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
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Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...
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Updated: May 28, 2026

Characterization of a Pathogenic Escherichia coli Strain Derived from Oreochromis spp. Farms Using Whole-Genome Sequencing
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Published on: December 23, 2022

What defines extraintestinal pathogenic Escherichia coli?

Christian-Daniel Köhler1, Ulrich Dobrindt

  • 1Institute for Hygiene, University of Münster, Robert-Koch-Str. 41, 48149 Münster, Germany.

International Journal of Medical Microbiology : IJMM
|October 11, 2011
PubMed
Summary

Extraintestinal pathogenic Escherichia coli (ExPEC) strains are difficult to distinguish from non-pathogenic E. coli. Further research is needed to understand ExPEC variants and host susceptibility for better infection control.

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Area of Science:

  • Microbiology
  • Genomics
  • Epidemiology

Background:

  • Escherichia coli (E. coli) encompasses diverse strains, including commensal gut flora and pathogenic variants causing intestinal and extraintestinal infections.
  • Extraintestinal pathogenic E. coli (ExPEC) are facultative pathogens residing commensally in some healthy individuals, unlike obligate intestinal pathogenic E. coli (IPEC).

Purpose of the Study:

  • To investigate genomic diversity and phenotypic traits for discriminating E. coli pathotypes.
  • To address the ambiguity in strain typing based on limited ExPEC virulence genes.

Main Methods:

  • Comparative genomics and epidemiological studies were employed.
  • Multi-locus sequence typing was used to identify ExPEC-dominated clonal complexes.

Main Results:

  • Many ExPEC and non-pathogenic E. coli strains share significant genomic similarities, complicating discrimination.
  • Strain typing using a few ExPEC virulence genes can be ambiguous.
  • Molecular epidemiological approaches struggle to clearly differentiate ExPEC from non-pathogenic E. coli.

Conclusions:

  • Understanding the phylogeny, virulence, fitness traits, and host factors of ExPEC variants is crucial.
  • Further research is required for a comprehensive understanding of the biological basis of ExPEC infections and host susceptibility.