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IFN-γ quantitative values in response to QFT-IT M. tuberculosis antigens in children with active TB and LTBI according to age groups. Individual IFN-γ levels in response to nil-corrected M. tuberculosis antigens (TB Ag) are reported in active TB and LTBI children divided into two age groups (≤5 years and >5 years old). Median values are indicated as solid red lines. The cutoff value for positive QFT-IT is represented by a dotted red line at 0.35 IU/ml. *, significant differences.
