WT, TLR9KO and TLR2/9DKO mice were vaccinated subcutaneously with Mtb-auxotroph. 9 weeks post-vaccination, single cell suspension was prepared from lungs, spleen and draining lymph nodes. Frequency of IFNγ+ cells was measured as number of spots upon ex vivo stimulation with Mtb-infected dendritic cells from lungs (a), spleen (b) and lymph nodes (c). Percent ESAT6+CD4+CD44hiCD62Llo T cells from the lungs were quantitated (d, e). Each group includes 4–5 mice per time point. (Data represented as mean+/− SEM, *** p<0.001 and ** p<0.01)