IL33 and infection: As expected, IL-33 deficiency impaired the production of IL-5 and IL-13 in the MLNs of infected mice in response to stimulation with SmSEA at 6 weeks of infection (t(8) = 6.595, P = 0.0002 for IL-5 and U = 2, P = 0.008 for IL-13; Fig. 2a, b).