Diagnostic Accuracy of Gene Xpert on Bronchoscopy Washings in Patients with Suspected Pulmonary Tuberculosis

uberculosis is caused by Mycobacterium species. The most common species is Mycobacterium Tuberculosis which usually infects humans in most cases. But other species can also infect humans like Mycobacterium bovis, Mycobacterium africanum, Mycobacterium microti and Mycobacterium canettii. 1 Tuberculosis is an air born infection and infectious droplets remain in environment when depend on certain factors like immunity of individual, duration of exposure and infectiveness of the source. 1 It is the immunity of the individual which contain the infection and does not allow its spread. In about 5% individual infection is not controlled and individual develops active TB within 1-2 years. 2 This is called primary tuberculosis. In other 5% individuals the immune system contain infection to localized site but mycobacterium remains in dormant infected person speaks, sneezes and coughs. 1 All stage and reactivate later on when the immunity of