1. Department of Veterinary Medicine & Institute of Preventive Veterinary Sciences, College of Animal Sciences, Zhejiang University, Hangzhou, China
2. Hainan Institute of Zhejiang University, Sanya, China
3. State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, National Medical Center for Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
4. Zhejiang Provincial Key Laboratory of Preventive Veterinary Medicine, Hangzhou, China