Predominance of dual positive cytokine producing cells in non-active disease states.

<p>The percentages of cells expressing IFN-γ only, IL-2 only, and dual-cytokine producing CD4 T cells after PPD specific stimulation in individuals with immunity consistent with latent <i>M. tuberculosis</i> infection (<b>A</b>) or BCG vaccination/NTM infection (<b>B</b>) were determined as described in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0017813#pone-0017813-g002" target="_blank">figure 2</a>.