畜牧兽医学报 ›› 2015, Vol. 46 ›› Issue (9): 1593-1599.doi: 10.11843/j.issn.0366-6964.2015.09.014

• 预防兽医 • 上一篇    下一篇

羊源致病性弗氏柠檬酸杆菌的分离与鉴定

刘会胜1,赵战勤1*,薛云2,薛巧1 ,汪洋1 ,常世恺1,刘媛1   

  1. (1.河南科技大学动物科技学院,河南省高等学校环境与畜产品安全重点学科开放实验室,洛阳 471003;2.河南科技大学医学技术与工程学院,微生物检验实验室,洛阳 471003)
  • 收稿日期:2015-01-09 出版日期:2015-09-23 发布日期:2015-09-23
  • 通讯作者: 赵战勤,博士,副教授,E-mail:zhaozhanqin@126.com,Tel:0379-64282341
  • 作者简介:刘会胜(1990-),男,河南桐柏人,硕士生,主要从事动物病原微生物学研究
  • 基金资助:

    国家自然科学基金项目(31302106);河南省科技攻关计划项目(132300410279)

Isolation and Identification of Citrobacter freundii from the Diseased Small Tail Han Sheep

LIU Hui-sheng1,ZHAO Zhan-qin1* ,XUE Yun2,XUE Qiao1,WANG Yang1,CHANG Shi-kai1,LIU Yuan1   

  1. (1.Lab of Veterinary Microbiology,College of Animal Science and Technology,Henan University of Science and Technology,Luoyang 471003,China;2.Lab of Medical Engineering,College of Medical Technology and Engineering,Henan University of Science and Technology,Luoyang 471003,China)
  • Received:2015-01-09 Online:2015-09-23 Published:2015-09-23

摘要:

旨在确定导致河南省某养殖场小尾寒羊细菌性感染死亡的病原。从3只不同时间发病死亡的小尾寒羊各组织脏器的病料中分离到3株细菌——LK-1、LK-2和LK-3株。经微生物自动鉴定仪鉴定和细菌16S rRNA基因序列分析,确定该致病菌为弗氏柠檬酸杆菌。小鼠毒力试验结果表明:3株细菌的LD50分别为5.0×107、6.0×107和5.8×107 CFU。回归试验结果表明,经人工感染健康小尾寒羊,可复制与自然发病羊相似的症状和病理变化,且从其各组织脏器内再次分离到相同的病原菌。药敏试验结果表明,3株弗氏柠檬酸杆菌对大部分药物的抗药谱相同(17/21),且均对头孢噻肟等11种药物高度敏感。这些研究结果表明弗氏柠檬酸杆菌是该小尾寒羊致死性病例的病原菌。本文在国内外首次报道了弗氏柠檬酸杆菌对小尾寒羊具有致病性。

Abstract:

To determine the pathogenic bacterium infecting the small tail Han Sheep,three strains,named LK-1,LK-2 and LK-3,were isolated from the heart,liver,spleen,lungs,kidney and intestines of three dead cases on a sheep farm in Henan province.Identification by the Biolog Microbial Identification System,and further 16S rRNA sequence and phylogenetic analysis demonstrated that the three isolates were Citrobacter freundii.Infection with the bacterial suspension to the healthy small tail Han Sheep could reproduce the diseased symptoms as occurred naturally and the same bacterium could be recovered from these infected sheep.Three isolates also have certain pathogenicity to the BALB/c mice,with the lethal doses of 5.0×107,6.0×107,5.8×107 CFU,respectively.The susceptibility test to antibiotics demonstrated that three isolates LK-1,LK-2 and LK-3 were susceptible to 14 drugs,including cefotaxime,gentamicin,tetracycline,chloramphenicol,enrofloxacin,etc.Three isolates have similar antimicrobial resistance profiles to 17 of 21 drugs in this study.But they have different profiles to 4 drugs,including amoxicillin,cefaclor,streptomycin and azithromycin.In this study,we reported the pathogenicity on Small Tail Han sheep of Citrobacter freundii at home and abroadfor the first time.Citrobacter freundii is the pathogen of the dead small tail Han Sheep cases.

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