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Characterization of Escherichia coli causing cellulitis in broilers.

Louise Ladefoged Poulsen1, Magne Bisgaard2, Steffen Lynge Jørgensen1

  • 1University of Copenhagen, Department of Veterinary Animal Science, Faculty of Health and Medical Sciences, Stigbojlen 4, DK- 1870, Frederiksberg, Denmark.

Veterinary Microbiology
|October 17, 2018
PubMed
Summary

A specific strain of Escherichia coli (E. coli) belonging to sequence type 117 (ST117) was identified as the primary cause of broiler cellulitis in Denmark. This finding highlights a significant pathogen impacting poultry production.

Keywords:
MLSTPFGESNPST117aatpicupaG

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Area of Science:

  • Veterinary Microbiology
  • Poultry Pathology
  • Bacterial Genomics

Background:

  • Cellulitis in Danish broiler production between 2014-2016 caused significant economic and welfare issues.
  • Unusually high condemnation rates linked to cellulitis prompted further investigation.

Purpose of the Study:

  • To investigate the causative agent of cellulitis in Danish broiler flocks.
  • To characterize the genetic relatedness and virulence factors of Escherichia coli isolates from affected birds.

Main Methods:

  • Post mortem examination and bacteriology on broiler carcasses and dead-on-arrival birds.
  • Pulsed field gel electrophoresis (PFGE) and multi-locus sequence typing (MLST) for bacterial strain characterization.
  • Whole genome sequencing (WGS) to identify genetic markers and virulence genes.

Main Results:

  • 247 pure cultures of E. coli were isolated from cellulitis lesions.
  • A dominant clone, identified by PFGE type A and belonging to ST117, was responsible for cellulitis in all 13 investigated flocks (67% of isolates).
  • WGS revealed the presence of adhesion-associated genes (aatA, pic, upaG) in the ST117 clone.

Conclusions:

  • Escherichia coli sequence type 117 (ST117) is the primary bacterial pathogen causing cellulitis in Danish broiler production.
  • The identified ST117 clone possesses virulence factors potentially contributing to its pathogenicity.
  • Understanding the genetic basis of this poultry pathogen is crucial for disease control.