Ranjan MAHADEVASWAMY, Samir JADHAV, Chandrakant BHONG, Dattatray GANDHALE, Rahul KOLHE, Saba NALBAND, Sujata BHAVE, Dushyant MUGLIKAR

Phylogrouping and antimicrobial resistance analysis of extraintestinal pathogenic Escherichia coli isolated from poultry species

This study was undertaken to determine the prevalence and antimicrobial resistance pattern of extraintestinal pathogenicEscherichia coli (ExPEC) in the feces of healthy poultry and retail chicken. All 146 E. coli recovered from 351 samples were screened byPCR for detection of ExPEC strains. Nineteen (13.01%) isolates were confirmed as ExPEC. Distribution of ExPEC strains was revealedas follows: broiler (25%), layer (15.87%), and raw chicken (3.12%). Turkey, duck, and water samples were negative for ExPEC strains.ExPEC strains belonged to phylogenetic groups B2 (52.63%), A (36.84%), and D (10.53%). Twenty-three (15.75%) isolates were ESBLpositive,including four ExPEC strains. ESBL-positive E. coli were isolated from all the samples except turkey. A high degree of resistanceto commonly used antimicrobials, namely nalidixic acid (95.89%), tetracycline (95.89%), trimethoprim (89.04%), colistin (82.88%), andciprofloxacin (54.11%), including β-lactam antimicrobials ampicillin (84.93%) and amoxicillin/clavulanic acid (81.51%), was expressedby the isolates. Out of fifteen randomly selected ESBL-positive E. coli isolates, β-lactam genes, namely blaTEM, blaCTX-M, and blaOXA,were detected in three, six, and one, respectively. Poultry and raw chicken harbor multidrug-resistant, ESBL-type E. coli as well as ExPECand these strains may be transmitted to humans via the food chain.

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