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表型与基因型不一致的结核病里芬素敏感性测试:对诊断准确性的影响
Mehmood Qadir1,2, Rani Faryal2, Muhammad Tahir Khan3,4
1National TB Control Program, National TB Reference Laboratory , Islamabad, Pakistan.
Microbiology spectrum
|November 20, 2023
概括
菌根生长指标管 (MGIT) 和洛文斯坦-詹森 (LJ) 药物敏感性测试 (DST) 显示与rpoB测序相比,对利法辛耐药性检测的不一致性. 由MGIT DST遗漏的新型突变凸显了在结核病管理中需要rpoB测序的必要性.
科学领域:
- 微生物学 微生物学
- 遗传学 是一个遗传学.
- 临床诊断 临床诊断 临床诊断
背景情况:
- 准确的药物耐药性诊断对于有效的结核病治疗至关重要.
- 里芬辛耐药性是多药耐药结核病 (MDR-TB) 的关键指标.
- 目前对利芬素耐药性的诊断方法包括表型药物敏感性测试 (DST) 和基因型rpoB测序.
研究的目的:
- 为了比较Mycobacteria Growth Indicator Tube (MGIT) DST和Lowenstein-Jensen (LJ) DST的诊断准确性,以检测对rpoB测序的里法辛耐药性.
- 为了识别与瑞芬素耐药性相关的rpoB基因中的新突变和缺失.
- 评估结核病药物耐药性检测中表型和基因型方法之间的不一致的临床影响.
主要方法:
- 用MGIT DST,LJ DST和rpoB基因测序测试了Mycobacterium结核病的临床分离物对利法辛耐药性的测试.
- rpoB基因测序被用作检测利芬素耐药性的黄金标准.
- 分析了这些方法之间的不一致率.
主要成果:
- 在对rpoB测序进行验证时,MGIT DST与LJ DST相比,观察到对利芬辛耐药性的不一致率更高.
- 几种新型突变和删除在rpoB基因中被确定在耐利芬素分离物中,其中一些被MGIT DST遗漏.
- 该研究确定了对临床管理有影响的特定异常模式.
结论:
- 与MGIT和LJ DST相比,rpoB测序提供了更准确的检测,特别是识别新型耐药机制.
- 这些发现强调了将rpoB测序纳入结核病诊断算法的重要性,特别是在高负荷环境中.
- 像rpoB测序这样的分子方法对于准确的诊断和指导耐药结核病的适当治疗策略至关重要,有可能改善患者的治疗结果并防止不当治疗.
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