Consistent with this finding and the potentially lower availability of IL‐33 in BALB/c mice,33 ST2 or IL‐33‐deficency in BALB/c mice does not affect worm killing in BALB/c mice, although ST2‐deficient mice have less recruitment of eosinophils, CD4+ T cells and macrophages to the site of infection.78, 120. Here, IL33 is linked to infection.