Groups of 4 B6 (WT) and caspase-1−/− (CASP1−/−) mice were infected i.n with 4×103 EID50 of PR8 influenza virus and levels of IL-1β (A), IL-18 (B), TNF-α (C), IL-6 (D), IFN-γ (E), IL-12p40 (F), KC (G), and MIP-2 (H) were measured in BAL fluid 3d later. Results are mean ± S.D.. Data were analyzed with Student’s t-test (*, p<0.05) and are representative of three independent experiments.