1. Department of Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
2. Veterinary Teaching Hospital, Center for Veterinary Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
3. Department of Animal Science and Technology, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
4. State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, Zhejiang Province, China
5. Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
6. MOA Key Laboratory of Animal Virology, Center for Veterinary Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China