1. School of Veterinary Medicine, Yangzhou University, Yangzhou 225009, P. R. China
2. Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, P. R. China
3. Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou 225009, Jiangsu, P. R. China
4. College of Veterinary Medicine, Albutana University, Rufaa 22217, Al Jazirah, Sudan