GDF15 and tuberculosis: No statistically significant difference was observed between the healthy and TB groups, with GDF15 values of 0.31±0.02 ng/mL in healthy subjects, 0.35±0.01 ng/mL (p = 0.0532) in active TB patients and 0.28±0.01 ng/mL (p = 0.1089) in latent TB patients (Fig 3).