1. National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, P.R. China
2. Hubei Provincial Bioengineering Technology Research Center for Animal Health Products, Yingcheng 432400, P.R. China
3. Cooperative Innovation Center of Sustainable Pig Production, Wuhan 430070, P.R. China
4. International Research Center for Animal Disease (Ministry of Science & Technology of China), Wuhan 430070, P.R. China
5. The HZAU-HVSEN Research Institute, Wuhan 430042, P.R. China