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Pooled within-study differences in sensitivity and specificity. A, Difference in sensitivity between QFT-Plus and QFT-GIT in 6 studies. B, Difference in specificity between QFT-Plus and QFT-GIT. Abbreviations: IFN-γ, interferon gamma; QFT-GIT; QuantiFERON-TB Gold In-Tube; QFT-Plus, QuantiFERON-TB Gold Plus.
