A. Filtrate of A. alternata heated to 95°C for 10 minutes retains little to no residual protease activity using casein as a substrate; ***p < 0.001. B. Heat-inactivated filtrate of A. alternata (hi-Aa) administered to upper airways as in Fig. 1A promotes eosinophil recruitment to the upper airways as does the active filtrate (Aa), n = 5 mice per group; ns, no significant difference, Mann-Whitney U-test. C. Survival of wild-type mice challenged with A. alternata (Aa), hi-Aa or diluent control as in Fig. 4A followed by Inf A (150 TCID50 units in 5 μL); n = 9 – 10 mice per group, *p = 0.05, **p < 0.005, Log-rank.