Low-dose infection with T. muris in Rag1−/− mice partially protects from papain-induced lung inflammation. (A) Total bronchoalveolar lavage (BAL) fluid cell and BAL fluid eosinophil counts. (B) PAS-stained sections of lungs, visualized using ×20 magnification. (C) Lung mRNA expression of Ifng and Il10 (relative to Actb). Data are means ± SEM, representative of 3 independent experiments (n = 4 to 5 mice per experiment) (A to C). Sections are representative of 3 independent experiments (B). Ctrl, control; Tm, T. muris infected; Rel., relative.