1. Center for Disease Control and Prevention of Sichuan Province, Chengdu, P. R. China
2. Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu Province, P. R. China
3. Key Laboratory of Food Safety Risk Assessment, National Health Commission of the People’s Republic of China, China National Center for Food Safety Risk Assessment, Beijing, P. R. China
4. Institute of Comparative Medicine, Yangzhou University, Yangzhou, Jiangsu Province, P. R. China