FIG 1.

IFN-γ and IP-10 plasma release in TB patients and healthy controls. Whole-blood samples from 89 TB patients and 99 healthy controls were stimulated for 20 h in QFT tubes, and IFN-γ and IP-10 plasma levels were measured. (A) IFN-γ release was determined using the official QFT ELISA. Dotted line represents cutoff (0.35 IU/ml). (B) IP-10 plasma release was determined using an in-house IP-10 ELISA. Dotted line represents calculated cutoff (0.83 ng/ml). Data represented are background subtracted (antigen minus nil), and median values are indicated in red. Statistical analysis was done using the Mann-Whitney test.