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Scatter dot plots showing IgG antibody concentrations. The tuberculin skin test (TST) and the QuantiFERON TB Gold In-Tube (QFT) were used to determine if individuals were uninfected or had latent tuberculosis infection (LTBI). Sputum smear microscopy was used to define APTB cases. The horizontal bars shown are median concentrations of IgG antibodies in each group. The p values shown correspond to results from Kruskal–Wallis test.
