Detection of IL-2 in addition to IFN-gamma discriminates active tuberculosis patients, latently infected individuals and controls

Effective control of tuberculosis (TB) includes discrimination of subjects with active TB from individuals with latent TB infection (LTBI). As distinct interferon (IFN)-c and interleukin (IL)-2 profiles of antigen-specific T-cells have been associated with different clinical stages and antigen loads in several viral and bacterial diseases, we analysed these cytokines in TB using a modified QuantiFERON-TB Gold In Tube test. Detection of IL-2 in addition to IFN-c distinguishes not only Mycobacterium tuberculosisinfected subjects from healthy controls, but also individuals with LTBI from active TB patients. This may help to improve diagnostic tests for TB