1. Department of Infectious Diseases, Institute of Virology, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
2. State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
3. Institute of Microbiology, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
4. College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
5. State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China