-TB Gold in-tube assay (QFT-GIT) and tuberculin skin test (TST) data upon inclusion from the 149 included children with both results and chest X-rays (CXRs) available. The QFT response is the level of IFN-γ (IU/ml) in the tuberculosis (TB) antigen-stimulated plasma sample with that for the negative control subtracted. Results for those 9 children who were diagnosed with TB at inclusion are represented by solid diamonds (in 2 children diagnosed with TB no QFT-GIT was performed). Results for those who showed TB sequelae at CXR are represented by asterisks. The arrows point to the results of 4/5 children (in 1 child no QFT-GIT was performed at inclusion) who progressed to active TB during follow-up. The dotted line represents the 0.35 IU/ml cutoff for the QFT-GIT test.