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Phenotypic and molecular characterizations of multidrug-resistant diarrheagenic *** of calf origin

Animal Diseases 2021年第3期1卷 192-204页

作者： Shan Yue Zecai Zhang Yu Liu Yulong Zhou Chenhua Wu Wenjing Huang Nannan Ghen Zhanbo Zhu College of Animal Science and Veterinary Medicine Heilongjiang Bayi Agricultural UniversityDaqing 163319China Heilongjiang Provincial Technology Innovation Center for Bovine Disease Control and Prevention Daqing 163319China Heilongjiang Provincial Key Laboratory of Prevention and Control of Bovine Diseases Daqing 163319China Heilongjiang Province Cultivating Collaborative Innovation Center for The Beidahuang Modern Agricultural Industry Technology Daqing 163319China

Escherichia coli has become one of the most important causes of calf *** aim of this study is to determine the patterns of antimicrobial resistance of *** isolates from six cattle farms and to identify prominent resistance genes and virulence genes among the strains isolated from the diarrhea of *** susceptibility tests were performed using the disk diffusion method,and PCR was used to detect resistance and virulence *** prevalence of multidrug resistant(MDR)*** was 77.8%in dairy cattle and 63.6%in beef *** were high resistance rates to penicillin(100%,100%)and ampicillin(96.3%,86.4%)in *** from dairy cattle and beef ***,resistance rate to antimicrobials and distribution of resistance genes in£coli isolated from dairy cattle were higher than those in beef *** analysis showed that the most prevalent resistance genes were blojm and oodAl in dairy cattle and beef cattle,***,seven diarrheagenic virulence genes(irp2,fyuA,Stx1,eoeA,F41,K99 and STa)were present in the isolates from dairy cattle,with a prevalence ranging from 3.7%to 22.22%.Six diarrheagenic virulence genes(irp2,fyuA,Stx1,eoeA,hylA and F41)were identified in the isolates from beef cattle,with a prevalence ranging from 2.27%to 63.64%.Our results provide important evidence for better exploring their interaction *** studies are also needed to understand the origin and transmission route of£coli in cattle to reduce its prevalence.

关键词： Dairy calves beef calves E.coli Multidrug resistant Virulence gene

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