1. College of Animal Science and Technology, Shandong Agricultural University, Tai’an, Shandong Province, People’s Republic of China
2. Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Tai’an, Shandong, People’s Republic of China
3. Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Tai’an, Shandong, People’s Republic of China
4. China Animal Health and Epidemiology Center, Qingdao, People’s Republic of China