American Journal of Infectious Diseases and Microbiology
ISSN (Print): 2328-4056 ISSN (Online): 2328-4064 Website: http://www.sciepub.com/journal/ajidm Editor-in-chief: Maysaa El Sayed Zaki
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American Journal of Infectious Diseases and Microbiology. 2017, 5(4), 126-131
DOI: 10.12691/ajidm-5-4-1
Open AccessArticle

Diagnostic Performance of Polymerase Chain Reaction Targeting Insertion Sequence (IS6110) for the Detection of Extra Pulmonary Tuberculosis

A. Chitra1, B. Usharani2, S. Smita1, C. K. Vidya Raj1, S. Anbazhagi3 and M. Muthuraj1,

1State TB Training and Demonstration Centre, Intermediate Reference Laboratory, Government Hospital for Chest Diseases, Puducherry, India

2Department of Biomedical Genetics, Institute of Basic Medical Sciences, University of Madras, Tamil Nadu, India

3Department of Environment Science, Central University, Kerala, India

Pub. Date: August 10, 2017

Cite this paper:
A. Chitra, B. Usharani, S. Smita, C. K. Vidya Raj, S. Anbazhagi and M. Muthuraj. Diagnostic Performance of Polymerase Chain Reaction Targeting Insertion Sequence (IS6110) for the Detection of Extra Pulmonary Tuberculosis. American Journal of Infectious Diseases and Microbiology. 2017; 5(4):126-131. doi: 10.12691/ajidm-5-4-1

Abstract

Background: The diagnostic challenges in extra-pulmonary tuberculosis remain to be addressed even though remarkable progress has been made in the diagnostics of pulmonary tuberculosis during the last decade. Methods: This study was conducted to evaluate the use of polymerase chain reaction (PCR) in diagnosis of definitive extra pulmonary tuberculosis patients, and to assess the performance of insertion sequence (IS)6110 based PCR assay as compared to conventional liquid culture by Microbial growth Indicator Tube (MGIT) 960 system. Results: A total of 792 clinical specimens were collected from clinically suspected extra pulmonary tuberculosis patients. The specimens included 22 ascitic fluids, 69 pleural fluids, 240 Cerebrospinal fluids (CSF), 386 endometrial tissues, 47 lymph nodes, 22 pus, one synovial fluid, one fallopian tube, two brain abscess and two ovarian cyst samples. All these clinical samples were subjected to Auromine O staining (FM) for acid fast bacilli (AFB) and culture on MGIT 960 tubes containing Modified Middlebrooks 7H9 broth medium. PCR was performed by targeting 123bp fragment of insertion sequence IS6110 of Mycobacterium tuberculosis. Our study of 792 specimens, revealed their 87.5% sensitivity to endometrial samples, 92.31% sensitivity for cerebrospinal fluid, and 66.66% sensitivity in Pleural fluid and 60% sensitivity in Lymph node samples. The combined sensitivity and specificity of the PCR IS6110 was calculated to be 85.71% and 82.91%, respectively. Conclusion: PCR using IS6110 primer was able to pick up more positivity in extra pulmonary samples as compared to conventional culture method for the detection of M. tuberculosis.

Keywords:
polymerase chain reaction mycobacterium tuberculosis extra pulmonary tuberculosis insertion sequence cerebrospinal fluid

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