TNF and infection: On day 28 post-infection as shown in Figure 5A, RT-qPCR (Figures 5B-D), ELISA (Figures 5E, F) and Greiss assay (Figure 5G) showed that the expression of lung TNF-α (Figures 5B, E), IL-6 (Figures 5C, F) and iNOS (Figure 5D)/NO (Figure 5G) was significantly higher in the RvΔPPE68 infection group than that in the H37Rv infection group.