1. College of Veterinary Medicine, Jilin University, Changchun, Jilin, PR China
2. Changchun Institute of Biological Products Co. Ltd., Changchun, Jilin, PR China
3. Changchun Institute of Biological Products, Changchun, Jilin, PR China
4. Key laboratory for Zoonosis, Ministry of Education, and Institute for Zoonosis of Jilin University, Changchun, Jilin, PR China