The lower sensitivity of IP-10 in previous studies could be due to the shorter incubation time with specific TB antigens for 18–24 h in the studies by Ruhwald, Goletti and others [14], [16], [17], [40], [41] whereas in our study stimulation continued for 3 days, the optimal time point for IP-10 detection. Here, CXCL10 is linked to tuberculosis.