›› 2016, Vol. 43 ›› Issue (2): 542-547.doi: 10.16431/j.cnki.1671-7236.2016.02.037

• 疾病防治 • 上一篇    下一篇

奶牛关节炎病原菌的分离与鉴定

简宗辉, 段锐锐, 陈培富   

  1. 云南农业大学动物科学技术学院, 昆明 650201
  • 收稿日期:2015-08-25 出版日期:2016-02-20 发布日期:2016-03-02
  • 通讯作者: 陈培富 E-mail:cltwins2003@sina.com
  • 作者简介:简宗辉(1990-),男,云南曲靖人,硕士,研究方向:微生物与免疫学,E-mail:379872582@qq.com
  • 基金资助:
    云南省高校兽医公共卫生重点实验室(A3007954)

Isolation and Identification of the Arthritis Pathogen from Dairy Cow

JIAN Zong-hui, DUAN Rui-rui, CHEN Pei-fu   

  1. College of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China
  • Received:2015-08-25 Online:2016-02-20 Published:2016-03-02

摘要: 为避免奶牛关节炎对牛场造成巨大经济损失,采集患病奶牛关节积液,应用胰蛋白胨肉汤琼脂分离培养病原菌,随后通过形态学方法、生化试验和PCR扩增16S rRNA基因片段及TA克隆测序对其进行鉴定.结果显示,该菌在血琼脂上产生明显的β溶血;光镜下可见该菌个体为单个或短链状排列的革兰氏阳性球菌;该菌七叶苷、麦芽糖、蔗糖、葡萄糖、过氧化氢酶试验均为阳性,对头孢唑啉、恩诺沙星、环丙沙星、氨苄西林、链霉素、氯霉素、新霉素、头孢吡肟8种抗生素敏感,对四环素、红霉素、强力霉素、阿米卡星4种抗生素耐药;该菌与金黄色葡萄球菌核苷酸同源性为91%,但与肉葡萄球菌核苷酸同源性为92%.依据该菌株16S rRNA基因片段测序结果,并结合生物学特性分析,初步将分离菌株鉴定为葡萄球菌属的细菌.本试验结果可为该牛场确诊和防治关节炎提供必要的试验依据.

关键词: 奶牛关节炎; 生物学特性; 16S rRNA; 葡萄球菌属

Abstract: This study was aimed to avoid the dairy cow arthritis,which could caus huge economic losses to cattle farms.Joint effusion was collected from diseased dairy cows,and the pathogens was isolated and cultured using tryptone broth agar followed by morphological,biochemical tests and PCR amplifying 16S rRNA gene fragments and TA cloning and sequencing to identify it.It was found that the bacteria could form beta hemolytic ring on blood AGAR;And it appeared a single individual or short catenation gram-positive by optical microscopy;The results of biochemical identification showed that esculin sesquihydrate,maltose,sucrose,glucose,and hydrogen peroxide enzyme tests all presented positive;It was sensitive to cefazolin,enrofloxacin,ciprofloxacin,ampicillin,streptomycin,chloramphenicol,neomycin and cefepime,while was resistant to tetracycline,erythromycin,doxycycline and amikacin.The nucleic acid homology of this strain with Staphylococcus aureus was 91%,and with the Staphylococcus carnosus was 92%.According to the 16S rRNA gene fragment sequencing results,and the biological characteristics analysis,the initial isolates were identified as similar to Staphylococcus spp bacteria.The results of this study could provide necessary experimental basis for future diagnosis,prevention as well as treatment of arthritis in cattle farm.

Key words: dairy cow arthritis; biological characteristics; 16S rRNA; Staphylococcus spp

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