1. Institute of Virology, University of Veterinary Medicine Hannover, Hannover, Germany
2. Institute for Pathology, University of Veterinary Medicine Hannover, Hannover, Germany
3. Department of Veterinary Medicine, National Taiwan University, Taiwan
4. Division of Veterinary Medicine, Paul-Ehrlich-Institut, Federal Institute for Vaccines and Biomedicines, Langen, Germany
5. German Center for Infection Research, TTU Emerging Infections, Langen, Germany