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RESEARCH PRODUCT

Extraintestinal pathogenic Escherichia coli sequence type 131 H30-R and H30-Rx subclones in retail chicken meat, Italy

Caterina MamminaWillem B. Van LeeuwenPaola Di CarloCelestino BonuraArash Ghodousi

subject

0301 basic medicineFimH30MeatAFLPST131Settore MED/17 - Malattie InfettiveAnimal foodExtraintestinal Pathogenic Escherichia colichicken030106 microbiologyBiologySettore MED/42 - Igiene Generale E ApplicataMicrobiologyH30-RxMicrobiologylaw.invention03 medical and health sciencesColi strainQuinolone resistanceChicken meatlawDrug Resistance BacterialAnimalsEscherichia coli sequence type 131Amplified Fragment Length Polymorphism AnalysisSafety Risk Reliability and QualityhumansPolymerase chain reactionPhylogenyExPECExtraintestinal Pathogenic Escherichia coliPhylogenetic treeGenetic heterogeneityE. coliGeneral Medicineβ-lactamaseItalyESBLFood MicrobiologyAFLP; Chicken meat; E. coli; ESBL; ExPEC; FimH30; H30-R; H30-Rx; ST131; Food Science; Microbiology; Safety Risk Reliability and QualityE.coliAmplified fragment length polymorphismChickensH30-RFluoroquinolonesPlasmidsFood Science

description

Extraintestinal pathogenic Escherichia coli sequence type 131 (ST131), typically fluoroquinolone-resistant (FQ-R) and/or extended-spectrum β-lactamase (ESBL)-producing, has emerged globally. Among clinical isolates, ST131, primarily its H30-R and H30-Rx subclones, accounts for most antimicrobial-resistant E. coli and is the dominant E. coli strain worldwide. We assessed its prevalence and characteristics among raw chicken meat samples on sale in Palermo, Italy. A collection of 237 fluoroquinolone resistant and ESBL/AmpC producing E. coli isolates, which had been isolated from processed retail chicken meat in the period May 2013-April 2015, was analyzed. Established polymerase chain reaction methods were used to define ST131 and its H30 subclones, ESBL, AmpC, and plasmid-mediated quinolone resistance (PMQR) determinants. Amplified Fragment Length Polymorphism (AFLP) was performed to assess the relatedness among ST131 isolates. Out of the 237 E. coli isolates, 12 isolates belonged to the phylogenetic group B2. Based on the molecular definition of ExPEC, all isolates were attributed with the status of ExPEC. SNP-PCR results confirmed that nine isolates were ST131. SNP-PCR for H30-R and H30-Rx subclones showed that six and three ExPEC ST131 were positive for H30-R and H30-Rx, respectively. The results of AFLP showed that, except for four isolates grouped into two clusters which proved to be indistinguishable, the isolates under study were genetically heterogeneous. To the best of our knowledge, this is the first report of H30-R and H30-Rx subclones in animal food samples. Our findings appear to support the role of food chain in their transmission to humans.

yearjournalcountryeditionlanguage
2016-04-06
10.1016/j.ijfoodmicro.2016.04.004https://doi.org/10.1016/j.ijfoodmicro.2016.04.004