1. College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
2. State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, China
3. Key Laboratory for Zoonosis Research of the Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, China