1. a Clinic for Poultry , University of Veterinary Medicine Hannover , Bünteweg 17, D-30559 , Hannover , Germany
2. b Institute of Medical Microbiology and Hygiene, University of Lübeck , Ratzeburger Allee 160, D-23538 , Lübeck , Germany
3. c Ripac-Labor GmbH , Am Mühlenberg 11, D-14476 , Potsdam-Golm , Germany