Exposure to DEP prior to infection with influenza increases markers of Th2-type immune response. A.) Cell-free BALF was analyzed for IL-13 levels. B.) Whole lung homogenates were analyzed for IL-4 levels. C.) Total RNA isolated from whole lung was analyzed for IL-4rα mRNA levels and normalized to β-actin mRNA levels. *significantly different from Sal/Sal control; p < 0.05.