Spread of extended-spectrum beta-lactamase producing Escherichia coli isolates in Swedish broilers mediated by an incI plasmid carrying blaCTX-M-1

Acta Veterinaria Scandinavica

Stefan Börjesson¹  Björn Bengtsson¹  Cecilia Jernberg²  Stina Englund¹ 

[1] Department of Animal health and Antimicrobial strategies, National Veterinary Institute (SVA), Uppsala, SE-751 89, Sweden

[2] Department of Preparedness, Swedish Institute for Communicable Disease Control (Nobelsväg 18), Solna, 17182, Sweden

关键词: Escherichia coli;    CTX-M-1;    Broiler;    ESBL;    Extended spectrum betalactamases;   

Others  :  789420
DOI  :  10.1186/1751-0147-55-3

 received in 2012-10-31, accepted in 2013-01-15,  发布年份 2013

【 摘 要 】

Background

The already high and increasing occurrence of extended-spectrum beta-lactamases (ESBL) producing Escherichia coli in European broiler populations is of concern due to the fact that third and fourth generation cephalosporins are deemed critically important in human medicine. In Sweden 34% of the broilers carry ESBL/pAmpC producing E. coli in their gut, despite the absence of a known selection pressure such as antimicrobial usages. The aim of the current study was to characterise a selection of E. coli strains carrying the bla_CTX-M-1, to determine if the spread was due to a specific clone.

Findings

Ten isolates carrying bla_CTX-M-1 from Swedish broilers belonged to eight different multi-locus sequence types with three isolates belonging to ST155. The ST155 isolates were identical as assessed by PFGE. The bla_CTX-M-1 was in all isolates carried on a plasmid of replicon type incI, which also transferred resistance to tetracycline and sulfamethoxazole.

Conclusion

The occurrence of ESBL-producing E. coli in the Swedish broilers is not due to the emergence of a single clone, but rather the spread of a specific incI plasmid carrying bla_CTX-M-1.

【 授权许可】

   
2013 Börjesson et al.; licensee BioMed Central Ltd.

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