1. Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, 3012 Bern, Switzerland
2. Leibniz Institute for Zoo and Wildlife Research, Department of Wildlife Diseases, Alfred-Kowalke-Straße 17, 10315 Berlin, Germany
3. Institute of Poultry Diseases, Faculty of Veterinary Medicine, Freie Universität Berlin, Königsweg 63, 14163 Berlin, Germany