Xpert MTB/RIF®, a novel automated polymerase chain reaction-based tool for the diagnosis of tuberculosis

Int J Tuberc Lung Dis. 2011 Jul;15(7):988-9. doi: 10.5588/ijtld.10.0574.

Abstract

There is an urgent need for new point of care tests for tuberculosis (TB). Xpert MTB/RIF® is a real-time polymerase chain reaction-based system that detects Mycobacterium tuberculosis DNA and rifampicin (RMP) resistance modulating mutations directly from clinical samples in 2 h. The sensitivity for detecting M. tuberculosis in culture-positive samples was 93.8% (60/64) and exceeded smear microscopy (40/64, 62.5%). The specificity for detecting M. tuberculosis was 92.0% (23/25) and for RMP resistance it was 100% (8/8). The test is simple to conduct and requires basic sputum handling facilities only. These characteristics render it a promising close-to-patient test for TB in various settings.

MeSH terms

  • Antibiotics, Antitubercular / pharmacology
  • DNA, Bacterial / analysis
  • Drug Resistance, Bacterial
  • Humans
  • Microbial Sensitivity Tests
  • Mycobacterium tuberculosis / drug effects*
  • Mycobacterium tuberculosis / genetics
  • Mycobacterium tuberculosis / isolation & purification
  • Polymerase Chain Reaction / methods*
  • Rifampin / pharmacology*
  • Sensitivity and Specificity
  • Specimen Handling / methods
  • Sputum / microbiology
  • Tuberculosis / diagnosis*
  • Tuberculosis / microbiology

Substances

  • Antibiotics, Antitubercular
  • DNA, Bacterial
  • Rifampin