1. Research Center for Emerging Infections and Zoonoses, University of Veterinary Medicine, Foundation, Hannover, Germany
2. Friedrich-Loeffler-Institute, Greifswald-Insel Riems, Germany
3. Department of Pathology, University of Veterinary Medicine, Foundation, Hannover, Germany
4. Sealcentre Pieterburen, Pieterburen, Netherlands
5. Landeslabor Schleswig-Holstein, Neumünster, Germany
6. Seehundstation Friedrichskoog, Friedrichskoog, Germany