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Spread of avian pathogenic Escherichia coli ST117 O78:H4 in Nordic broiler production.
BMC Genomics. 2017 01 03; 18(1):13.BG

Abstract

BACKGROUND

Escherichia coli infections known as colibacillosis constitute a considerable challenge to poultry farmers worldwide, in terms of decreased animal welfare and production economy. Colibacillosis is caused by avian pathogenic E. coli (APEC). APEC strains are extraintestinal pathogenic E. coli and have in general been characterized as being a genetically diverse population. In the Nordic countries, poultry farmers depend on import of Swedish broiler breeders which are part of a breeding pyramid. During 2014 to 2016, an increased occurrence of colibacillosis on Nordic broiler chicken farms was reported. The aim of this study was to investigate the genetic diversity among E. coli isolates collected on poultry farms with colibacillosis issues, using whole genome sequencing.

METHODS

Hundred and fourteen bacterial isolates from both broilers and broiler breeders were whole genome sequenced. The majority of isolates were collected from poultry with colibacillosis on Nordic farms. Subsequently, comparative genomic analyses were carried out. This included in silico typing (sero- and multi-locus sequence typing), identification of virulence and resistance genes and phylogenetic analyses based on single nucleotide polymorphisms.

RESULTS

In general, the characterized poultry isolates constituted a genetically diverse population. However, the phylogenetic analyses revealed a major clade of 47 closely related ST117 O78:H4 isolates. The isolates in this clade were collected from broiler chickens and breeders with colibacillosis in multiple Nordic countries. They clustered together with a human ST117 isolate and all carried virulence genes that previously have been associated with human uropathogenic E. coli.

CONCLUSIONS

The investigation revealed a lineage of ST117 O78:H4 isolates collected in different Nordic countries from diseased broilers and breeders. The data indicate that the closely related ST117 O78:H4 strains have been transferred vertically through the broiler breeding pyramid into distantly located farms across the Nordic countries.

Authors+Show Affiliations

National Veterinary Institute, Technical University of Denmark, Bülowsvej 27, 1870, Frederiksberg C, Denmark. troro@vet.dtu.dk.Statens Serum Institut, Department of Microbiology and Infection Control, Artillerivej 5, 2300, Copenhagen S, Denmark.Department of Veterinary Disease Biology, University of Copenhagen, Stigbøjlen 4, 1870, Frederiksberg C, Denmark.Norwegian Veterinary Institute, Ullevaalsveien 68, 0454, Oslo, Norway.Norwegian Veterinary Institute, Ullevaalsveien 68, 0454, Oslo, Norway.Finnish Food Safety Authority, Veterinary Bacteriology, Neulaniementie 4, FI-70210, Kuopio, Finland.Statens Serum Institut, Department of Microbiology and Infection Control, Artillerivej 5, 2300, Copenhagen S, Denmark.National Veterinary Institute, Technical University of Denmark, Bülowsvej 27, 1870, Frederiksberg C, Denmark.Statens Serum Institut, Department of Microbiology and Infection Control, Artillerivej 5, 2300, Copenhagen S, Denmark.National Veterinary Institute, Technical University of Denmark, Bülowsvej 27, 1870, Frederiksberg C, Denmark.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

28049430

Citation

Ronco, Troels, et al. "Spread of Avian Pathogenic Escherichia Coli ST117 O78:H4 in Nordic Broiler Production." BMC Genomics, vol. 18, no. 1, 2017, p. 13.
Ronco T, Stegger M, Olsen RH, et al. Spread of avian pathogenic Escherichia coli ST117 O78:H4 in Nordic broiler production. BMC Genomics. 2017;18(1):13.
Ronco, T., Stegger, M., Olsen, R. H., Sekse, C., Nordstoga, A. B., Pohjanvirta, T., Lilje, B., Lyhs, U., Andersen, P. S., & Pedersen, K. (2017). Spread of avian pathogenic Escherichia coli ST117 O78:H4 in Nordic broiler production. BMC Genomics, 18(1), 13. https://doi.org/10.1186/s12864-016-3415-6
Ronco T, et al. Spread of Avian Pathogenic Escherichia Coli ST117 O78:H4 in Nordic Broiler Production. BMC Genomics. 2017 01 3;18(1):13. PubMed PMID: 28049430.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Spread of avian pathogenic Escherichia coli ST117 O78:H4 in Nordic broiler production. AU - Ronco,Troels, AU - Stegger,Marc, AU - Olsen,Rikke Heidemann, AU - Sekse,Camilla, AU - Nordstoga,Anne Bang, AU - Pohjanvirta,Tarja, AU - Lilje,Berit, AU - Lyhs,Ulrike, AU - Andersen,Paal Skytt, AU - Pedersen,Karl, Y1 - 2017/01/03/ PY - 2016/09/14/received PY - 2016/12/12/accepted PY - 2017/1/5/entrez PY - 2017/1/5/pubmed PY - 2017/9/12/medline KW - APEC KW - Colibacillosis KW - Comparative genomics KW - Phylogenetic analysis KW - Virulence factors SP - 13 EP - 13 JF - BMC genomics JO - BMC Genomics VL - 18 IS - 1 N2 - BACKGROUND: Escherichia coli infections known as colibacillosis constitute a considerable challenge to poultry farmers worldwide, in terms of decreased animal welfare and production economy. Colibacillosis is caused by avian pathogenic E. coli (APEC). APEC strains are extraintestinal pathogenic E. coli and have in general been characterized as being a genetically diverse population. In the Nordic countries, poultry farmers depend on import of Swedish broiler breeders which are part of a breeding pyramid. During 2014 to 2016, an increased occurrence of colibacillosis on Nordic broiler chicken farms was reported. The aim of this study was to investigate the genetic diversity among E. coli isolates collected on poultry farms with colibacillosis issues, using whole genome sequencing. METHODS: Hundred and fourteen bacterial isolates from both broilers and broiler breeders were whole genome sequenced. The majority of isolates were collected from poultry with colibacillosis on Nordic farms. Subsequently, comparative genomic analyses were carried out. This included in silico typing (sero- and multi-locus sequence typing), identification of virulence and resistance genes and phylogenetic analyses based on single nucleotide polymorphisms. RESULTS: In general, the characterized poultry isolates constituted a genetically diverse population. However, the phylogenetic analyses revealed a major clade of 47 closely related ST117 O78:H4 isolates. The isolates in this clade were collected from broiler chickens and breeders with colibacillosis in multiple Nordic countries. They clustered together with a human ST117 isolate and all carried virulence genes that previously have been associated with human uropathogenic E. coli. CONCLUSIONS: The investigation revealed a lineage of ST117 O78:H4 isolates collected in different Nordic countries from diseased broilers and breeders. The data indicate that the closely related ST117 O78:H4 strains have been transferred vertically through the broiler breeding pyramid into distantly located farms across the Nordic countries. SN - 1471-2164 UR - https://www.unboundmedicine.com/medline/citation/28049430/Spread_of_avian_pathogenic_Escherichia_coli_ST117_O78:H4_in_Nordic_broiler_production_ L2 - https://bmcgenomics.biomedcentral.com/articles/10.1186/s12864-016-3415-6 DB - PRIME DP - Unbound Medicine ER -