The Application of Xpert Mycobacterium tuberculosis/Rifampicin, Quantitative Polymerase Chain Reaction and High Resolution Melting Curve in the Diagnosis of Superficial Lymph Node TB.

Author(s): Yi Han, Ning Xiao, Shaojung Huang, Ming Qin, Nanying Che*, Zhidong Liu*.

Journal Name: Current Pharmaceutical Biotechnology

Volume 20 , Issue 12 , 2019

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Graphical Abstract:


Objective: The diagnostic sensitivity and specificity of conventional methods for superficial lymph node tuberculosis (LNTB) are not ideal. We evaluated several novel methods including Xpert Mycobacterium tuberculosis/rifampicin (Xpert MTB/RIF) technology, quantitative fluorescence Polymerase Chain Reaction (qPCR) and High-Resolution Melting Curve (HRMC) in the diagnosis of superficial lymph node TB.

Methods: Specimens from eighty-one consecutive patients with suspected LNTB and thirteen cases with other lymph node disease were analyzed by Xpert MTB/RIF, qPCR, and HRMC.

Results: Among 81 patients with clinical suspicion of LNTB, there were 74 (91.4%) cases positive Mycobacterium tuberculosis Complex (MTBC) of Xpert MTB/RIF, 60 (74%) positive of qPCR, 24 (29.6%) of positive of BACTEC MGIT960 culture, and 13 (16%) cases positive of Roche culture. 38 cases (46.9%) were diagnosed with LNTB. All test methods showed a diagnostic specificity of 100% for LNTB. The sensitivity of molecular biology techniques was significantly higher than that of the traditional diagnostic methods, and Xpert MTB/RIF was the most sensitive diagnostic assay. On Rifampinresistant detection, Xpert MTB/RIF detected three cases (3.7%) with rpoB gene mutation, and Mycobacterium tuberculosis susceptibility testing detected 2 rifampicin-resistant cases (2.4%) which were consistent with Xpert MTB/RIF results. In the Isoniazid-resistant, 7 cases (8.1) of isoniazid resistance mutations (8.1%) were detected by HNC and 1 case was confirmed by Isoniazid susceptibility test.

Conclusion: Molecular detection increased the diagnostic sensitivity of LNTB and improved the detection sensitivity for rifampin and isoniazid resistance strain.

Keywords: Lymph node TB, Xpert MTB/RIF, Rifampin, isoniazid, resistance, High-Resolution Melting Curve (HRMC).

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Article Details

Year: 2019
Page: [1044 - 1054]
Pages: 11
DOI: 10.2174/1389201020666190716104131
Price: $58

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