Isolation, genotyping and antimicrobial susceptibility of pathogenic Escherichia coli serotypes in ready to eat foods

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DOI: https://doi.org/10.12681/jhvms.21790
F. KARADAL
Department of Food Processing, Bor Vocational School, Nigde Omer Halisdemir University, Nigde, Turkey
N. ERTAS ONMAZ
Department of Food Hygiene and Technology, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey
H. HIZLISOY
Department of Veterinary Public Health, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey
S. AL
Department of Food Hygiene and Technology, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey
N. TELLI
University of Selcuk, Vocational School of Technical Sciences, Konya, Turkey
Y. YILDIRIM
Department of Food Hygiene and Technology, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey
Z. GONULALAN
Department of Food Hygiene and Technology, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey
Abstract

In this study, pathogenic Escherichia coli serotypes (E. coli O157:H7, O26, O111) and their molecular proximity and antimicrobial susceptibility were investigated in RTE foods. A total of 240 samples; consist of 105 stuffed mussel, 56 meatless cig kofte, 54 Russian salad, 25 cheese halva, were analyzed. The conventional culture and serotyping methods for determination of the organisms were performed and further confirmation by PCR was carried out. Confirmed E. coli O157 isolates were genotyped by the enterobacterial repetitive intergenic consensus

(ERIC)-PCR. Antibacterial susceptibility testing of the isolates was performed by disc diffusion method. E. coli was detected in 7 (2.9 %) of 240 samples, including 3 (5.5%) Russian salad, 3 (2.8%) stuffed mussel, 1 (4 %) cheese halva. Two isolates from Russian salad, 1 from stuffed mussel and 1 from cheese halva were identified as E. coli O157 . In addition, stuffed mussel isolate was found to carry stx1 ve hlyA genes whereas one Russian salad isolate carried the stx1 gene. E. coli isolates were found to be resistant to amoxycillin/clavulonic acid, gentamicin and ciprofloxacin, at the rate of 29%, 14% and 29 %, respectively. Only one (14 %) isolate from stuffed mussel was classified as multidrug resistant to three antimicrobials. Furthermore, the isolates, related to O157 and O157:H7, presented different ribotypes in this study. The results provide useful data for the development of public health policy concerning the potential presence of pathogenic antimicrobial resistant E. coli serotypes in RTE foods. Strict surveillance of RTE foods at retail points for emerging pathogens, their antimicrobial resistance patterns and the potential likelihood of cross-contamination is required.
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