Utility of GeneXpert MTB/RIF assay for the diagnosis of pulmonary and extra-pulmonary tuberculosis, A report from Egypt
M. Hefzy, E., I. Ahmed, M., M. Ahmed, A., Y. Ali, D. (2021). Utility of GeneXpert MTB/RIF assay for the diagnosis of pulmonary and extra-pulmonary tuberculosis, A report from Egypt. EKB Journal Management System, 5(1), 1146-1161. doi: 10.21608/nrmj.2021.149391
Enas M. Hefzy; Mona I. Ahmed; Abdelrahman M. Ahmed; Doaa Y. Ali. "Utility of GeneXpert MTB/RIF assay for the diagnosis of pulmonary and extra-pulmonary tuberculosis, A report from Egypt". EKB Journal Management System, 5, 1, 2021, 1146-1161. doi: 10.21608/nrmj.2021.149391
M. Hefzy, E., I. Ahmed, M., M. Ahmed, A., Y. Ali, D. (2021). 'Utility of GeneXpert MTB/RIF assay for the diagnosis of pulmonary and extra-pulmonary tuberculosis, A report from Egypt', EKB Journal Management System, 5(1), pp. 1146-1161. doi: 10.21608/nrmj.2021.149391
M. Hefzy, E., I. Ahmed, M., M. Ahmed, A., Y. Ali, D. Utility of GeneXpert MTB/RIF assay for the diagnosis of pulmonary and extra-pulmonary tuberculosis, A report from Egypt. EKB Journal Management System, 2021; 5(1): 1146-1161. doi: 10.21608/nrmj.2021.149391

Utility of GeneXpert MTB/RIF assay for the diagnosis of pulmonary and extra-pulmonary tuberculosis, A report from Egypt

Novel Research in Microbiology Journal
Volume 5, Issue 1, January and February 2021, Page 1146-1161  XML PDF (344.96 K)
Document Type: Original Article
DOI: 10.21608/nrmj.2021.149391
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Authors
Enas M. Hefzy email orcid 1; Mona I. Ahmed2; Abdelrahman M. Ahmed3; Doaa Y. Ali4
1Department of Medical microbiology and Immunology, Faculty of Medicine, Fayoum University, Al Fayoum, Egypt
2Department of Chest diseases and Tuberculosis, Faculty of Medicine, Al Fayoum University, Fayoum, Egypt
3Department of Chest diseases and Tuberculosis, Fayoum Chest Hospital, Al Fayoum, Egypt
4Department of Clinical and Chemical pathology, Faculty of Medicine, Fayoum University, Al Fayoum, Egypt
Abstract
Early diagnosis of tuberculosis continues to be a challenge for clinicians. The World Health Organization (WHO) guidelines recommend the application of GeneXpert MTB/RIF in extra-pulmonary tuberculosis (EPTB) diagnosis. This study aimed to test and compare the accuracy of the GeneXpert MTB/RIF assay to diagnose pulmonary tuberculosis (PTB) and EPTB, compared to bacterial culture and to composite reference standard (CRS).  The GeneXpert assay diagnosed tuberculosis (TB) in 19.5 % of patients. With reference to bacterial culture, the sensitivity of this assay for detection of the pulmonary and extra-pulmonary specimens was perfect. For pulmonary specimens, on using CRS; the detected sensitivity and specificity of the GeneXpert assay were 78.3 % and 99.1 %, respectively. However, for extra-pulmonary specimens, the sensitivity and specificity of the GeneXpert assay were 37.1 % and 99 %, respectively. In the current study, the GeneXpert assay showed almost perfect agreement with the bacterial culture for TB diagnosis. The diagnostic accuracy of the GeneXpert assay was high in ruling in, but not in ruling out of EPTB. 
Keywords
GeneXpert MTB/RIF, Extra-pulmonary TB; Pulmonary TB, Egypt
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