检验医学 ›› 2023, Vol. 38 ›› Issue (11): 1032-1035.DOI: 10.3969/j.issn.1673-8640.2023.11.005

• 论著 • 上一篇    下一篇

Xpert MTB/RIF与结核分枝杆菌利福平耐药表型检测一致性分析

茹浩浩, 陈连勇, 杨星, 陈涛, 闫双群, 许琳()   

  1. 云南省疾病预防控制中心结核病防治所,云南 昆明 650022
  • 收稿日期:2022-03-29 修回日期:2023-01-12 出版日期:2023-11-30 发布日期:2024-01-10
  • 通讯作者: 许 琳,E-mail:xulinth@hotmail.com
  • 作者简介:茹浩浩,男,1987年生,学士,主管检验师,主要从事病原微生物学研究。

Analysis of rifampicin resistance in Mycobacterium tuberculosis determined by Xpert MTB/RIF and phenotypic drug susceptibility test

RU Haohao, CHEN Lianyong, YANG Xing, CHEN Tao, YAN Shuangqun, XU Lin()   

  1. Institute for Tuberculosis Prevention and Treatment,Center for Disease Control and Prevention of Yunnan,Yunnan 650022,Kunming,China
  • Received:2022-03-29 Revised:2023-01-12 Online:2023-11-30 Published:2024-01-10

摘要:

目的 探讨Xpert MTB/RIF和表型药物敏感性试验(pDST)检测结核分枝杆菌(MTB)利福平(RFP)耐药性结果的一致性,以及产生不一致结果的原因。方法 对2020年云南省耐药监测中行Xpert MTB/RIF检测的672株MTB进行比例法pDST,对2种方法结果不一致的菌株进行全基因组测序(WGS)。结果 以pDST结果为标准,Xpert MTB/RIF检测MTB RFP耐药的敏感性为94.44%,特异性为97.32%,阳性预测值为66.67%,阴性预测值为99.52%。672株MTB中,有19株(2.83%)Xpert MTB/RIF与pDST检测结果不一致。2株Xpert MTB/RIF显示RFP敏感,pDST显示RFP耐药菌株中,未检出耐药突变1株,检出rpoB-Ile491Phe突变1株;17株Xpert MTB/RIF显示RFP耐药,pDST显示RFP敏感菌株均发现RFP耐药相关突变。Xpert MTB/RIF与pDST检测结果不一致的19株MTB均未发现明显的异质性耐药情况。结论 Xpert MTB/RIF与pDST检测MTB RFP耐药结果一致性较好。结果不一致的主要原因为pDST结果的不稳定性、部分rpoB基因突变与RFP耐药相关性差,以及少数菌株发生了Xpert MTB/RIF靶点以外的其他罕见突变。

关键词: 结核分枝杆菌, Xpert MTB/RIF, 表型药物敏感性试验, 利福平, 耐药

Abstract:

Objective To investigate the consistency between the results of Xpert MTB/RIF and phenotypic drug susceptibility test(pDST) determining rifampicin(RFP) resistance in Mycobacterium tuberculosis(MTB) and the cause of inconsistent results. Methods A total of 672 MTB isolates determined by Xpert MTB/RIF in Yunnan 2020 were determined by pDST,and the whole genome sequencing(WGS) was performed for the isolates with inconsistent results. Results With pDST as the gold standard,the sensitivity and specificity of Xpert MTB/RIF for MTB with RFP resistance were 94.44% and 97.32%,respectively. The positive predictive value was 66.67%,and the negative predictive value was 99.52%. Xpert MTB/RIF was inconsistent with pDST for MTB with RFP resistance in 19 isolates(2.83%). The 2 isolates of Xpert MTB/RIF showed sensitive to RFP,pDST showed resistant,no mutation in 1 isolate and rpoB-Ile491Phe mutation in 1 isolate. RFP resistance-related mutations were found in the 17 isolates of Xpert MTB/RIF showed resistant to RFP,and pDST showed sensitive. No significant hetero-resistance was found. Conclusions Xpert MTB/RIF has good consistency with pDST for MTB with RFP resistance. The main reasons for inconsistent results are the instability of pDST results,the poor correlation between some rpoB gene mutations and RFP resistance and the occurrence of other mutations other than Xpert MTB/RIF targets in a few isolates.

Key words: Mycobacterium tuberculosis, Xpert MTB/RIF, Phenotypic drug susceptibility test, Rifampicin, Drug resistance

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