Clinical efficacy of metagenomic next-generation sequencing for rapid detection of Mycobacterium tuberculosis in smear-negative extrapulmonary specimens in a high tuberculosis burden area

Abstract

Objective: The aim of this study was to assess the clinical utility of metagenomic next-generation sequencing (mNGS) on smear-negative extrapulmonary specimens collected in China. Methods: Specimens were tested by mNGS and other routine tests for tuberculosis (TB). The diagnostic accuracy of mNGS was calculated and compared with the final clinical diagnosis. Results: The sensitivity of mNGS was found to be significantly higher than the sensitivities of the other routine TB tests. Receiver operating characteristic curve analysis showed that mNGS achieved the highest area under the curve (AUC) value of 0.79. The mNGS positive rate was highest for tuberculous meningitis. All non-tuberculous extrapulmonary pathogens were directly and simultaneously detected. Conclusions: mNGS appeared to be superior to all previous etiological tests for TB on smear-negative extrapulmonary specimens and could identify all possible pathogens at once within 48 h.

Keywords

• Mycobacterium tuberculosis
• Metagenomic next-generation sequencing
• Extrapulmonary tuberculosis
• Rapid diagnosis
• Gene Xpert MTB/RIF assay