Levels of individual analytes in all TB cases (TB) and household contacts (HHC). Each dot represents the analyte level of one participant in the study and horizontal lines represent the median values. Asterixes indicate significant differences between the TB cases (n = 23) and household contacts (n = 34). ##: p < 0.0001, #: p < 0.01, ¶¶: p = 0.01, ¶: p = 0.02. Nil: unstimulated analyte levels, Ag: Levels obtained after stimulation with Mycobacterium tuberculosis specific antigen cocktail (ESAT-6, CFP-10 and TB7.7), Ag-Nil: difference between the Mycobacterium tuberculosis specific antigen stimulated and the unstimulated levels.