1. College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
2. Key Lab of Animal Bacteriology, Ministry of Agriculture, Nanjing, China
3. OIE Reference Lab for Swine Streptococcosis, Nanjing, China
4. The Sanya Institute of Nanjing Agriculture University, Sanya, China
5. College of Veterinary Medicine, Yangzhou University, Yangzhou, China
6. NHC Key Laboratory of Enteric Pathogenic Microbiology, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, China