Fig. 1From: Testing for Mycobacterium tuberculosis infection using the QuantiFERON-TB GOLD assay in patients with comorbid conditions in a tertiary care endemic settingIFNγ titers in QFT-GIT negative and QFT-GIT positive TB patients. Whole blood from study subjects was incubated in QFT-GIT (NIL, TB and mitogen) tubes for 18 h. ELISA was performed to detect IFN-γ levels. Data is represented in the form of scatter plots. Horizontal line indicates cut-off at 0.35 IU/mLBack to article page