1. Institute of Virology, University of Veterinary Medicine Hannover, Hannover, Germany
2. Institute of Pathology, University of Veterinary Medicine Hannover, Hannover, Germany
3. Department of Pathology, Mahanakorn University of Technology, Bangkok, Thailand
4. Institute of Microbiology, University of Veterinary Medicine Hannover, Hannover, Germany
5. Clinic for Swine and Small Ruminants, Forensic Medicine and Ambulatory Service, University of Veterinary Medicine Hannover, Hannover, Germany
6. Institute of Medical Microbiology and Hospital Epidemiology, Hannover Medical School and German Center for Infection Research (DZIF), Hannover, Germany