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Scatter plot of IFN-γ concentrations in 25 cases with discrepant results between the TBF and QFT-Plus tests. Cut-off of both tests: IFN-γ 0.35 IU/mL (dotted line). Abbreviation: IFN-γ, interferon-gamma; TBF, Standard E TB-Feron ELISA; QFT-Plus, QuantiFERON-TB Gold Plus; TB, tuberculosis.
