浙江农业学报

• 动物科学 • 上一篇    下一篇

一株副乳房链球菌的分离鉴定及生物学分析

  

  1. (1.四川农业大学 动物医学院,四川 成都 611130; 2.动物疫病与人类健康四川省重点实验室,四川 成都 611130)
  • 出版日期:2016-05-25 发布日期:2016-05-19

Isolation, identification and biological characteristics analysis of Streptococcus parauberis

  1. (1. College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China;2. Key Laboratory of Animal Disease and Human Health of Sichuan Province, Chengdu 611130, China)
  • Online:2016-05-25 Published:2016-05-19

摘要: 从四川省某大型养殖场病死猪肺脏分离到一株副乳房链球菌,观察该菌株的生长特性、染色特性,进行生化鉴定、药敏鉴定、毒力试验以及16S rRNA基因序列进化树分析。结果显示:该分离株的16S rRNA序列与副乳房链球菌的同源性为99%。分离株在TSA琼脂培养基上呈光滑圆形,半透明的菌落,在血琼脂上呈β溶血;对小鼠的致病性试验测得LD50为206×107 cfu·只-1;药敏试验表明,其对头孢类药物较为敏感,对喹诺酮类、四环素类以及氨基糖苷类不敏感。该研究为该菌的临床诊断、疾病预防、选药治疗等奠定了基础。

关键词: 副乳房链球菌, 猪, 16S rRNA, 分离鉴定

Abstract: One strain of Streptococcus parauberis was isolated from a large scale pig farm in Sichuan Province. In this study, gram staining, culture characteristics, biochemical tests, antibiotic sensitivity tests, and 16S rRNA gene sequence analysis were used to identify the strain characteristics and resistance to drugs. The results of the 16S rRNA sequencing of the isolated strain showed 99% homology with Streptococcus parauberis. The colonies of the isolated strain on TSA agar appeared to be smooth, circular and translucent and had βhemolysis on blood agar. The LD50 of isolated strain to mice was 206×107 cfu per mouse. The antibiotic sensitivity experiment showed that it was sensitive to cephalosporin antibiotics but insensitive to quinolone, tetracycline and aminoglycoside antibiotics. This study laid a foundation in clinical diagnosis, disease prevention and drug treatment for associate streptococcus disease.

Key words: Streptococcus parauberis, swine, 16S rRNA, isolation and identification