An increase in CD4 count was associated with a decrease in mortality (aHR 0.82 per increase of 50 cells/mm3, 95% CI: 0.81–0.83, p < 001) and the initiation of ART during TB treatment was most strongly associated with lower TB mortality (aHR 0.39, 95% CI: 0.35–0.42, p < 0.001). The gene discussed is CD4; the disease is tuberculosis.