Infection elicited expression of the proinflammatory chemokines CXCLi1 (chemokine [C-X-C] motif) ligand i1) (Fig. 1a.i), CXCLi2 (Fig. 1b.i), and interleukin-1β (IL-1β) (Fig. 1c.i) in the ceca of all breeds at 2 days postinfection (dpi). Here, IL1B is linked to infection.