Figure 4: Expression of IL-7Rα in CD4+ T-cells after Mtb challenge. The frequency of IL-7Rα cell surface expression within the different CD45RA/CCR7 CD4+ T-cell subsets from vaccinated and control animals (all infected with Mtb) is displayed as box plots. 4/6 BCG-vaccinated show a decrease of IL-7Rα+ CD4+ T-cell 2 weeks after Mtb challenge, and 2/3 non-vaccinated animals showed a decreased expression of IL-7Rα 15 weeks after Mtb challenge.