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中国防痨杂志 ›› 2025, Vol. 47 ›› Issue (7): 901-906.doi: 10.19982/j.issn.1000-6621.20240543

• 论著 • 上一篇    下一篇

噻吩-2-羧酸肼生化实验鉴别牛分枝杆菌的可行性分析

杨新宇1, 陈昊1, 代小伟1, 李悄2, 庞梦迪2, 李波3, 缪鸿豪2, 李洁1,2(), 李传友1,2()   

  1. 1 北京市疾病预防控制中心结核病实验室,北京 100013
    2 首都医科大学公共卫生学院,北京 100038
    3 北京市疾病预防控制中心结核病门诊部,北京 100013
  • 收稿日期:2024-12-03 出版日期:2025-07-10 发布日期:2025-07-03
  • 通信作者: 李传友,Email:lichuanyou@ccmu.edu.cn; 李洁,Email:lijie304304@163.com
  • 基金资助:
    首都卫生发展科研专项(2024-2G-30114)

Feasibility analysis of identification of Mycobacterium bovis by thiophen-2-carboxylic acid hydrazine biochemical test

Yang Xinyu1, Chen Hao1, Dai Xiaowei1, Li Qiao2, Pang Mengdi2, Li Bo3, Miao Honghao2, Li Jie1,2(), Li Chuanyou1,2()   

  1. 1 Tuberculosis Laboratory, Beijing Center for Disease Prevention and Control, Beijing 100013, China
    2 School of Public Health, Capital Medical University, Beijing 100038, China
    3 Department of Tuberculosis Outpatient, Beijing Center for Disease Prevention and Control, Beijing 100013, China
  • Received:2024-12-03 Online:2025-07-10 Published:2025-07-03
  • Contact: Li Chuanyou, Email: lichuanyou@ccmu.edu.cn; Li Jie, Email: lijie304304@163.com
  • Supported by:
    Capital’s Funds for Health Improvement and Research(2024-2G-30114)

摘要:

目的:评估使用噻吩-2-羧酸肼鉴别培养基作为鉴定牛分枝杆菌的可靠性。方法:使用对硝基苯甲酸和噻吩-2-羧酸肼鉴别培养基对2019年1月1日至12月31日从北京市14家结核病防治机构和6家定点医院收集到的1267株分枝杆菌临床分离株进行鉴定,并对结核分枝杆菌复合群中浓度为5μg/ml的噻吩-2-羧酸肼鉴别培养基中菌落数小于20个的菌株再次接种至含5μg/ml、2.5μg/ml、1.25μg/ml、0.63μg/ml的噻吩-2-羧酸肼罗氏培养基中进行敏感度测试,同时对菌落数小于20个的菌株进行PCR扩增,对扩增产物进行琼脂糖凝胶电泳,根据是否产生168bp条带判断是否为牛分枝杆菌。结果:1267株分枝杆菌临床分离株中有1177株属于结核分枝杆菌复合群,其中148株菌在5μg/ml的噻吩-2-羧酸肼鉴别培养基中菌落数小于20,更换培养基后再次对148株菌进行鉴定,其中在5μg/ml的噻吩-2-羧酸肼鉴别培养基中敏感的菌株为27株,在2.5μg/ml的噻吩-2-羧酸肼鉴别培养基中敏感的菌株为10株,使用分子生物学PCR技术鉴定148株分离株,仅有1株为牛分枝杆菌。结论:使用噻吩-2-羧酸肼鉴别牛分枝杆菌误差率较高,不能作为可靠的鉴定依据。

关键词: 分枝杆菌, 牛, 生物化学, 可行性研究

Abstract:

Objective: To evaluate the reliability of using thiophene-2-carboxylic acid hydrazide medium for identifying Mycobacterium bovis. Methods: One thousand two hundred and sixty-seven clinically isolated mycobacterium strains collected from 14 tuberculosis prevention and control institutions and 6 designated hospitals in Beijing from January 1 to December 31, 2019 were identified by medium containing P-nitrobenzoic acid and thiophen-2-carboxylic acid hydrazide. The strains of Mycobacterium tuberculosis complex (MTBC) with fewer than 20 colonies growing on culture medium containing 5 μg/ml thiophene-2-carboxylic acid hydrazine were re-inoculated into roche culture medium containing 5 μg/ml, 2.5 μg/ml, 1.25 μg/ml and 0.63 μg/ml thiophene-2-carboxylic acid hydrazine from another reagent company for sensitivity testing. At the same time, these strains were amplified by PCR and the products were subjected to agarose gel electrophoresis to determine whether they were Mycobacterium bovis by the presence of 168 bp bands. Results: Of the 1267 clinical mycobacterium isolates, 1177 strains belonged to MTBC, and 148 of these strains formed fewer than 20 colonies after culture on the medium containing 5 μg/ml of thiophene-2-carboxylic acid hydrazine. After changing into using medium from another reagent company, there were 27 sensitive strains in the 5 μg/ml medium and 10 sensitive strains in a lower concentration (2.5 μg/ml) of the same medium. In addition, molecular biological PCR experiments showed that only 1 of the 148 isolates was identified as Mycobacterium bovis. Conclusion: The error rate of thiophene-2-carboxylic acid hydrazine medium for identifying Mycobacterium bovis was high, so this method could not be used as a reliable identification evidence.

Key words: Mycobacterium bovis, Biochemistry, Feasibility studies

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