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Early secretory antigenic target-6–free IFN-γ release assay antigen recognition by South African adolescents. Heat map of log10(IFN-γ) showing recognition patterns of all antigens in each QFT-negative (left) and QFT-positive (right) participant. In the absence of a cutoff to define recognition of each E6FI antigen, log10(IFN-γ) are presented on a continuous quantitative scale. Abbreviations: IFN-γ, interferon-gamma; QFT, QuantiFERON-TB Gold In-tube.
