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Tuberculosis Research and Treatment
Volume 2012 (2012), Article ID 834836, 5 pages
Clinical Study

Assessment of Status of rpoB Gene in FNAC Samples of Tuberculous Lymphadenitis by Real-Time PCR

1Department of Pathology, University College of Medical Sciences, Shahdara, Delhi 110095, India
2Directorate of Health Services, Government of NCT of Delhi, Karkardoma, Delhi 110032, India

Received 5 February 2012; Revised 13 May 2012; Accepted 14 May 2012

Academic Editor: W. N. Rom

Copyright © 2012 Amita Raoot and Geeta Dev. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Introduction. Multidrug resistance tuberculosis (MDR TB), the combined resistance of Mycobacterium tuberculosis to isoniazid (INH) and rifampin (RFM) is a major public health problem in India as it ranks second among the MDR-TB high burden countries worldwide. WHO recommends RFM resistance as a “surrogate marker” for detecting MDR. FNAC is the most widely used noninvasive investigative technique for TB lymphadenitis. Real-time polymerase chain reaction, an extremely versatile technique can be used for the timely detection and treatment of MDR TB by assessing RFM resistance status in the FNAC samples of TB lymphadenitis. Aim. To assess the status of rpoB gene by real-time PCR in FNAC samples of TB lymphadenitis. Materials and Methods. Thirty FNAC samples from patients with persistent LAP or appearance of new LAP after 5 months or more of Anti Tubercular Treatment were assessed for status of rpoB gene by Real-Time PCR using probe covering the “hot spot resistance” region of the rpoB gene. Result. By using probe covering codons 531 and 526 of rpoB gene, we could detect 17 of 30 (56.7%) rifampin resistant isolate. The PCR could detect Mtb DNA in 100% of cases. Conclusion. Use of molecular methods like Real-Time PCR for detection of MDR-TB in FNAC samples is time saving, logical and economical approach over the culture based method.