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March 13, 20260 citations

Comparative evaluation of sputum microscopy and Xpert MTB/RIF assay for tuberculosis detection and rifampicin resistance surveillance in Biratnagar, Nepal.

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SOShristy OjhaAAAkash AdhikariSASujan Adhikari

Key Points

  • The study aims to compare the diagnostic performance of Xpert MTB/RIF assay with conventional smear microscopy for tuberculosis detection and rifampicin resistance in Biratnagar, Nepal.
  • Analyzed 509 clinical specimens from TB suspects
  • Used Ziehl-Neelsen staining, fluorescence microscopy, and Xpert MTB/RIF
  • Evaluated sensitivities and specificities of the diagnostic methods
  • Determined prevalence of rifampicin resistance and its association with prior treatment
  • Xpert detected 31.2% of positive TB cases, significantly more than microscopy methods
  • ZN and FM sensitivities were 55.9% and 68.5% respectively
  • 5.03% of Xpert-positive samples showed rifampicin resistance
  • Retreatment cases had a much higher rate of RR-TB at 66.7% compared to 1.3% in new cases
  • Xpert improved detection in challenging specimen types such as paucibacillary and extrapulmonary.

Abstract

Tuberculosis (TB) control in Nepal faces persistent challenges due to underdiagnosis and increasing drug resistance. This study assessed the diagnostic performance of the Xpert MTB/RIF assay compared with conventional smear microscopy and estimated the prevalence of rifampicin-resistant TB (RR-TB) in Biratnagar, a high-burden urban center. Between March and September 2023, 509 clinical specimens from TB suspects were analyzed by Ziehl-Neelsen (ZN) staining, fluorescence microscopy (FM), and Xpert MTB/RIF. Using Xpert as the operational reference, ZN and FM exhibited overall sensitivities of 55.9% (89/159) and 68.5% (109/159), respectively. In paired sputum-only analyses (n = 446; sputum Xpert positives = 145), ZN and FM sensitivities were 60.0% (87/145) and 70.3% (102/145), respectively; sputum specificity was 100% for both methods. Xpert detected 31.2% (159/509) positive cases-78.7% more than ZN and 45.9% more than FM. Rifampicin resistance was identified in 5.03% (8/159) of Xpert-positive samples and was strongly associated with prior treatment (P 5% of Xpert-positive patients, higher than national averages for new cases, and a markedly elevated risk among previously treated patients. Rapid detection of resistance permits earlier initiation of appropriate therapy and can reduce onward transmission.

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Cite This Study

Ojha et al. (2026) studied this question.

synapsesocial.com/papers/69b3ad1302a1e69014ccf510https://doi.org/10.1128/spectrum.02460-25
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