CXCL9 and tuberculosis: In order to develop a new highly sensitive and specific method for fast serological diagnosis of active tuberculosis, we selected three cytokines (I-309, IL-8 and MIG) as biomarkers based on a quantitative cytokine array analysis, and developed an active TB diagnostic system which combines the detection of cytokines with that of antibodies for TB-specific antigens (Ag14-16kDa, Ag32kDa, Ag38kDa and Ag85B).