1. State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, P.R. China
2. Shandong Vocational Animal Science and Veterinary College, Weifang, P.R. China
3. Institute of Animal Husbandry and Veterinary Science, Wuhan Academy of Agricultural Science and Technology, Wuhan 430070, P.R. China
4. Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, P.R. China
5. International Research Center for Animal Disease, Ministry of Science and Technology, Wuhan 430070, P.R. China
6. Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture and Rural Affairs of China, Wuhan 430070, P.R. China