PRF1 and tuberculosis: Similarly, CFP10‐specific perforin were increased in PBMCs of LTBI individuals (2.21 ± 0.41 ng/mL) compared to ATB patients (1.33 ± 0.38 ng/mL), healthy controls (0.29 ± 0.51 ng/mL), or non‐TB control subjects (0.31 ± 0.41 ng/mL), (P < .001), (Figure 2C).