›› 2018, Vol. 45 ›› Issue (8): 2334-2340.doi: 10.16431/j.cnki.1671-7236.2018.08.036

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Isolation, Identification and Drug Resistance Analysis of a Bovine Buttiauxella agrestis

DU Lin, WANG Lifang, FENG Xiaohui, ZHANG Sanfen, SONG Jie, YAO Yiping, SHI Pei   

  1. Inner Mongolia Academy of Agriculture & Animal Husbandry Sciences, Hohhot 010010, China
  • Received:2018-01-15 Online:2018-08-20 Published:2018-08-15

Abstract:

To understand the biological characteristics and resistance of pathogenic microorganisms of dairy cows with mastitis,a gram-negative bacterium,named HLJ-36,was isolated from dairy cow's mastitis milk.Morphological characteristics,biochemical identification,molecular biological identification,mouse pathogenicity test and drug susceptibility test were performed.Biochemical test results showed that xylose,ONPG,citrate and so on were positive;Oxidase,sputum,urease and so on were negative.The physicochemical characteristics and molecular biological test results showed that the isolate was consistent with the characteristics of Buttiauxella agrestis,and had the highest homology with human Buttiauxella agrestis (GenBank accession No.:NR_041968.1) isolated from intestine,reaching 99%.The pathogenicity test in mice showed that mice in the experimental group did not die within 72 hours,indicating that the isolate was less pathogenic.Drug susceptibility test results showed that the bacteria were resistant to ceftiofur,azithromycin,ciprofloxacin,etc.,and sensitive to cefoxitin,meropenem,chloramphenicol,amoxicillin-clavulanic acid,and gentamicin.The results showed that Buttiauxella agrestis might be a pathogen causing dairy cow mastitis and had a certain degree of drug resistance,due to the highest homology of this strain and human Buttiauxella agrestis (GenBank accession No.:NR_041968.1),there was a possibility of transmission to humans through milk and dairy products,which had certain public health significance.

Key words: Buttiauxella agrestis; isolation and identification; drug sensitive test

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