However, at 60 days postinfection, the lung of OM‐TB‐TKO mice, contained significantly fewer cells (Figure 3B), but with higher frequencies of CD25+ CD4+ T cells (Figure 3E), CD69+ CD25+ CD4+ T cells (Figure 3F), KLRG1+ CD4+ T cells (Figure 3J), and lower frequencies of PD1+ CD4+ T cells (Figure 3G), and PD1+ CD27− CD4+ T cells (Figure 3I) than Y‐TB‐TKO or O‐TB‐TKO mice. This evidence concerns the gene CD27 and tuberculosis.