Number of IFN-γ-, IL-5- and IL-4-positive cells in 5–10 representative areas per spleen section, expressed as number of cells/mm2; solid bars represent healthy animals, hatched bars show mice at day 7 of DSS feeding, cross-hatched bars represent mice at day 14 after stopping DSS, open bars indicate mice at day 35 after stopping DSS. *Significantly different compared with healthy controls, P < 0.05.