1. Clinic for Poultry, University of Veterinary Medicine Hannover, Bünteweg 17, 30559 Hannover, Germany
2. Department of Pathobiology, Ontario Veterinary College, University of Guelph, N1G 2W1 Guelph, Ontario, Canada
3. Heidemark GmbH, Veterinary Laboratory, 39340 Haldensleben, Germany