1. College of Veterinary Medicine, Nanjing Agricultural University , Nanjing, China
2. OIE Reference Lab for Swine Streptococcosis , Nanjing, China
3. Key Lab of Animal Bacteriology, Ministry of Agriculture , Nanjing, China
4. The Sanya Institute of Nanjing Agriculture University , Sanya, China
5. College of Veterinary Medicine, Yangzhou University , Yangzhou, China
6. Key Laboratory of Veterinary Biological Engineering and Technology of Ministry of Agriculture, Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences , Nanjing, China