CD4 and Salmonella Infections: We found that S. Infantis induces an increase in the proportion of proinflammatory CD4+ IFNγ+ T cells in Peyer’s patches in pigs; however, little is known regarding the roles of CD4+/− CCR6+/− T cells or CCR6+/− IFNγ+/− T cells during Salmonella infection.