Figure 6. Cytokine levels in the serum of WT and TNF-α KO mice after intranasal S. pneumoniae infection. IFN-γ (A), IL-12p70 (B) and IL-10 (C) levels in the serum of WT and TNF-α KO mice were measured using ELISAs and values expressed as the means±SD. ^*P<0.05 and ^**P<0.01 compared with WT mice.