1. Department of Veterinary Medicine, College of Animal Sciences, Institute of Preventive Veterinary Medicine, Zhejiang University, Hangzhou, Zhejiang, China
2. Zhejiang Province Key Laboratory of Veterinary Medicine, MOA Key Laboratory of Animal Virology, Zhejiang University, Hangzhou, Zhejiang, China
3. Hangzhou Academy of Agricultural Sciences, Hangzhou, Zhejiang, China
4. Yongyou Industry Park, Yazhou Bay Sci-Tech City, Sanya, China