1. State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150069, China.
2. Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun 130062, China.
3. Institute of Western Agriculture, The Chinese Academy of Agricultural Sciences, Harbin 150069, China.