Abstract
Escherichia coli O157:H7 is one of the most dangerous pathogens causing food-borne diseases on over the world, and cattle are the most popular reservoirs. A total of 24 E. coli O157:H7/H- strains (11 E. coli O157:H7 strains, 13 E. coli O157:H- strains) isolated from cattle in the Mekong Delta were clarified the prevalence of pathogenic genes (stx1, stx2, eae, EHEC-hlyA) and antimicrobial susceptibility with 12 antibiotics. By using PCR assay, the prevalence of these pathogenic genes in 24 E. coli O157:H7/H- strains were stx1 (29.17%), stx2 (33.33%), eae (37.50%), and EHEC-hlyA (33.33%); there were 7/11 of E. coli O157:H7 strains that had all four pathogenic genes observed. Those E. coli O157:H7/H- strains were completely susceptible (100%) to 7 antibiotics (ceftazidime, gentamycin, amikacin, kanamycin, tetracycline, ciprofloxacin, and norfloxacin). However, those strains showed relatively high resistance against ampicillin (50.00%), followed by nalidixic acid (16.67%), bactrim (12.50%), amox-clavulanic (8.33%), and ceftriaxone (8.33%). Moreover, those E. coli O157:H7/H- strains showed multidrug-resistant to 2-5 kinds of antibiotics in 5 multi-resistant phenotypes observed.
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