1. Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Nanjing, China
2. College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
3. School of Life Sciences, Jiangsu University, Zhenjiang, China
4. OIE Reference Lab for Swine Streptococcosis, Nanjing, China
5. Key Laboratory of Animal Bacteriology, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China