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Genomic analysis of Shiga toxin-producing *Escherichia coli* O157:H7 from cattle and pork-production related environments

Veterinary Science

Genomic analysis of Shiga toxin-producing *Escherichia coli* O157:H7 from cattle and pork-production related environments

P. Zhang, S. Essendoubi, et al.

This fascinating study reveals the genetic connections of *E. coli* O157:H7 strains linked to contaminated pork from pigs and cattle in Alberta, Canada. The research, conducted by Peipei Zhang and colleagues, uncovers insights into the origins of recent outbreaks, highlighting pigs as a significant source of this dangerous pathogen.

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Playback language: English
Abstract
This study investigates the phylogenetic relatedness of *E. coli* O157:H7 from pigs, cattle, and pork-production environments in Alberta, Canada, to determine the source of recent outbreaks linked to contaminated pork. Limited strain diversity was observed using conventional subtyping methods. Whole-genome single nucleotide polymorphism (SNP) analysis confirmed the recent ancestry of isolates from all three sources, with most environmental isolates clustering closer to pig isolates than cattle isolates. A direct link was found between 2018 outbreak environmental isolates and isolates from a pig farm in 2018. Pig isolates primarily harbored the *stx₂a* Shiga toxin gene, while cattle isolates frequently possessed both *stx₁a* and *stx₂a*. The findings suggest that pigs can be a significant source of *E. coli* O157:H7.
Publisher
npj Science of Food
Published On
Jan 15, 2021
Authors
Peipei Zhang, Saida Essendoubi, Julia Keenliside, Tim Reuter, Kim Stanford, Robin King, Patricia Lu, Xianqin Yang
Tags
E. coli O157:H7
pigs
cattle
pork-production
outbreaks

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