1. Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China
2. Department of Preventive Veterinary Medicine, Jiangsu Co-Innovation Center for Important Animal Infectious Diseases and Zoonosis, Yangzhou, Jiangsu, China
3. Shandong Academy of Agricultural Sciences, Institute of Poultry Science, Jinan, Shandong, China