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Year : 2014  |  Volume : 41  |  Issue : 2  |  Page : 89-93

Evaluation of polymerase chain reaction using primer MPB 64 for diagnosis of clinically suspected cases of extrapulmonary tuberculosis

1 Department of Microbiology, Smt. Kashibai Navale Medical College and General Hospital, Narhe Ambegaon (Bk.), Pune, Maharashtra, India
2 Department of Microbiology, B. J. Medical College and Sassoon General Hospitals, Station Road, Pune, Maharashtra, India

Correspondence Address:
Vrishali A. Muley
Department of Microbiology, Smt. Kashibai Navale Medical College and General Hospital, Survey No. 49/1, 53/2, Off Mumbai-Pune Bypass, Narhe Ambegaon (Bk.), Pune - 411 041, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0974-5009.132837

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Background: Pulmonary tuberculosis can be easily diagnosed by simple techniques such as microscopy. However, extrapulmonary tuberculosis (EPTB) often presents a diagnostic dilemma. Microscopy and culture have proved to be insensitive techniques for diagnosis of EPTB. There is an urgent need for rapid and sensitive diagnostic methods. Aim: The present study was conducted to evaluate the role of polymerase chain reaction (PCR) in the early diagnosis of clinically suspected cases of EPTB. Materials and Methods: A total of 80 clinical specimens comprising pleural fluid, cerebrospinal fluid, ascitic fluid, fine-needle aspiration biopsy, and pus and biopsy from clinically suspected EPTB cases were processed and followed up by conventional methods and PCR using MPB64 primer. Results: Tuberculous pleural effusion (71%) was found to be the most common clinical presentation of EPTB. Overall, PCR could detect EPTB in 61.2% cases. Microscopy and culture could detect 18.7% and 22.5% EPTB cases, respectively. PCR was positive in all tissue samples suggestive of tuberculosis on histopathological examination. Of the 62 EPTB patients who responded to antituberculosis treatment (ATT), 49 patients were PCR positive. Conclusion: PCR using MPB64 had a significant advantage over the conventional methods to detect the presence of M. tuberculosis in specimens of clinically suspected EPTB patients for early diagnosis of tuberculosis.

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