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Plasma from PPD-negative volunteers (Uninfected), patients with latent TB infection (Latent), or patients with active TB disease (Active) were assayed by ELISA against the surface of live M. intracellulare (A,D) M. avium (B,E), and M. fortuitum (C,F). Log10 total Ig titers and relative IgG avidity are displayed. Two-sided p-values by student’s t-test or Mann-Whitney test: (*) p≤0.05, (**) p≤0.01, (***) p≤0.001.
