IL10 and Crohn ileitis: In the present study we were further able to demonstrate that anti-inflammatory IL-10 levels were multifold increased in the MLN following ileitis induction, but even more distinctly upon additional P. aeruginosa infection, whereas conversely, serum IL-10 concentrations were lower in P. aeruginosa infected as compared to non-infected hma mice suffering from acute ileitis.