Anti-NarL IgA, anti-19 kDa IgA, and anti-AlaDH IgA detected the LTBI (high IgA) subgroup, which comprised the progressor to active TB, with a distinct signal-to-noise ratio compared to the non-LTBI community controls (Figures 2(a), 2(b), and 2(f)). The gene discussed is CD79A; the disease is tuberculosis.