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• W2606475481 abstract "Background: Food-producing animals are under suspicion for the reservoir and colonization of ESBL (extended-spectrum beta-lactamase)-producing bacteria especially Enterobacteriaceae and therefore infection of the humans with them. The increasing reports on the ESBLs presence in the pathogenic and commensal Escherichia coli isolates have been a concern worldwide. These strains can be attributed to one of the main phylogenetic groups and subgroups. Several studies have shown the relationship between the phylogeny and antimicrobial resistance of E. coli strains. Objectives: The aim of this study was to analyze the phylogenetic group of ESBL-producing E. coli and detect its phenotype using the multiplex polymerase chain reaction (PCR) and combined disk method. Materials and Methods: Two hundred five E. coli fecal isolates were obtained from 103 calves (90 healthy and 13 diarrheic) and 102 dairy cows (healthy) from 8 farms in Khuzestan province, Iran. The triplex PCR method was used to allocate the E. coli isolates based on the presence or absence of 3 genes (chuA, yjaA, and tspE4.C2) to yield 4 definite phylogenetic groups and 7 subgroups. Phenotypic ESBL-producing E. coli was determined using the double disk diffusion method according to the manufacturer’s instructions and Clinical & Laboratory Standards Institute (CLSI) guidelines. Results: A total of 65.04% and 22.3% of isolates from calves and 70.5% and 20.5% of isolates from dairy cows belonged to phylogroups B1 and A, respectively. In addition, no isolate from the diarrhoeic calves was found to belong to group B2 and subgroups D2 and A0. A low prevalence (2/205 isolates, 0.97%) of ESBL-producing E. coli was found only in the samples of dairy cows which belonged to the phylogenetic group A and phylogenetic subgroup A1. There was no statistically significant relationship between the phylogenetic group and the production of ESBLs (P = 0.11). There was also no difference between the E. coli isolates from calves and dairy cows in the production of ESBLs (P = 0.5). Conclusion: There was no statistically significant relationship between the phylogenetic group and the production of ESBLs (P = 0.11). There was also no difference between E. coli isolates from calves and dairy cows in the production of ESBLs (P = 0.5). Based on these results, there is a low prevalence of ESBL-producing E. coli in the dairy farms of Khuzestan province. However, further large scale investigations are necessary to control the antibiotic resistance in the human and animal foodstuff." @default.
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• W2606475481 date "2017-02-01" @default.
• W2606475481 modified "2023-10-13" @default.
• W2606475481 title "Phylogenetic Grouping and Phenotypic Detection of Extended-Spectrum β-Lactamases Among Escherichia coli From Calves and Dairy Cows in Khuzestan, Iran" @default.
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• W2606475481 doi "https://doi.org/10.15171/ijep.2017.06" @default.
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