FASLG and tuberculosis: Flow cytometry analyses showed that Vδ2+ T cell FasL expression levels in the peripheral blood of anergic tuberculosis patients (2.63 ± 2.84%) were significantly higher than in TST-positive tuberculosis patients (1.54 ± 1.70%) and healthy controls (1.13 ± 1.06%) (q = 2.440 and 3.326, P = 0.016 and 0.001).