IL13 and infection: It has been shown that macrophages from IL13−/− mice phagocytosed greater numbers of UV-killed C. muridarum than WT macrophages [57], which, in the context of our study, could mean vaccine-mediated IL13 secretion make macrophages refractory to C. muridarum uptake in the urethra/testis, depleting the infection reservoir and decreasing disease severity.