河南农业科学 ›› 2022, Vol. 51 ›› Issue (1): 141-145.DOI: 10.15933/j.cnki.1004-3268.2022.01.017

• 畜牧·兽医 • 上一篇    下一篇

猪链球菌临床分离株对利奈唑胺的耐药性及耐药机制研究

杨影影,易开放,张俊锴,罗行炜,刘佩仪,韩荣嘉,胡功政
  

  1. (河南农业大学动物医学院,河南 郑州 450002)
  • 收稿日期:2021-08-13 出版日期:2022-01-15 发布日期:2022-03-18
  • 通讯作者: 胡功政(1964-),男,河南信阳人,教授,博士,主要从事细菌耐药分子机制研究和新兽药研发。E-mail:yaolilab@126.com
  • 作者简介:杨影影(1996-),女,河南信阳人,在读硕士研究生,研究方向:细菌耐药性。E-mail:2445565239@qq.com
  • 基金资助:
    国家重点研发计划项目(2016YFD05101304)

Research on Linezolid Resistance and Mechanism in Clinical Isolates of Streptococcus suis

YANG Yingying,YI Kaifang,ZHANG Junkai,LUO Xingwei,LIU Peiyi,HAN Rongjia,HU Gongzheng   

  1. (College of Veterinary Medicine,Henan Agricultural University,Zhengzhou 450002,China)
  • Received:2021-08-13 Published:2022-01-15 Online:2022-03-18

摘要: 为了解河南、江西、湖南、湖北、安徽、山西、陕西等7个省份猪链球菌临床分离菌株对利奈唑胺的耐药情况,并探讨其对利奈唑胺耐药的分子机制,以2016—2019年从7个省份收集的猪链球菌分离株为研究对象,将其接种在含有利奈唑胺的BHI平板上,初筛利奈唑胺耐药的分离株,利用PCR方法检测利奈唑胺相关耐药基因[optrA、cfr、cfr(B)、cfr(C)和poxtA],采用微量肉汤稀释法测定含有相关耐药基因菌株的多重耐药情况。初筛结果显示,178株分离菌株中有13株能够在含有利奈唑胺(4 mg/L)的BHI平板上生长;PCR检测结果显示,在13株利奈唑胺耐药菌株中均检出了optrA 基因,其中,有2株同时检出了cfr 基因。此外,13株optrA/cfr 阳性菌株对阿米卡星、庆大霉素、红霉素、阿奇霉素、杆菌肽、多西环素、克林霉素、氟苯尼考、氯霉素存在严重的耐药性,均为多重耐药菌株。综上,利奈唑胺耐药菌株均携带optrA 基因,optrA基因在介导利奈唑胺耐药中占据主导地位,且阳性菌株多重耐药情况严重,应对猪链球菌中optrA 基因的存在进行密切监测,并加强抗菌药物在养猪业中的规范使用。

关键词: 猪链球菌, 利奈唑胺, 耐药机制, 耐药基因

Abstract: AThe aim was to determine the resistance of Streptococcus suis clinical isolates to linezolid in seven provinces including Henan,Jiangxi,Hunan,Hubei,Anhui,Shanxi and Shaanxi,and analyze the mechanism of linezolid resistance. S. suis isolates collected from seven provinces in China between 2016 and 2019 were used as research subjects. BHI plates containing linezolid were prepared to screen linezolid‐resistant isolates. PCR method was used to detect linezolid resistance genes[optrA,cfr,cfr(B),cfr(C)and poxtA].Antimicrobial susceptibility test was conducted by broth microdilution for the multidrug resistance of strains containing cfr or optrA genes. Results showed that 13 of 178 isolates were able to grow on the selective medium containing linezolid(4 mg/L).The PCR results showed that all 13 linezolid‐resistant strains carried optrA gene,among which two strains carried cfr gene.The antimicrobial susceptibility test results showed that all cfr or optrA‐positive S. suis isolates were severely resistant to amikacin,gentamicin,erythromycin,azithromycin,bacitracin,doxycycline,clindamycin,florfenicol and chloramphenicol. In conclusion,all linezolid resistant strains carried optrA gene,which was dominant in mediating linezolid resistance,and all cfr or optrA‐positive S.suis stains were multiple resistant strains.Therefore,the routine surveillance of optrA gene of S. suis should be performed and the standard use of
antibiotics should be strengthened in pig industry.

Key words: Streptococcus suis, Linezolid, Resistance mechanism, Resistance gene

中图分类号: