Knittel, J.Kroll, J.Mathes, M.Sick, F.Roof, M.2013-12-042013-12-042000-08-11https://hdl.handle.net/11299/161155en-USswinepigherd healthEFFICACY OF AN AVIRULENT LAWSONIA INTRACELLULARlS VACCINE IN SWINEConference Paper