IL33 and infection: i.n. inoculation with 1 PFUs of PVM at 7 days old; reinoculation (20 PFUs) at 42 days post infection (dpi) or with 1 mg cockroach extract at days 3, 45, 52, 59 and 66 dpi. At 94 dpi, the mice were treated with rIL-33 (40 μg/kg) or inoculated with HRV-1B (5.106 TCID50) with or without an IL-33 inhibitor. In some experiments, HDM or LPS was used instead of cockroach extract