IL10 and infection: Following peroral infection with comparable bacterial loads of approximately 109 CFU on two consecutive days (namely days 0 and 1) by gavage, E. coli, A. butzleri strains CCUG 30485 and C1 as well as C. jejuni were stably colonizing the intestinal tract of gnotobiotic IL-10-/- mice, as indicated by high median bacterial loads of between 108 and 109 CFU per g feces (Fig 1).