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. Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, China