1 College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210014, Jiangsu, China
2 Key Laboratory of Animal Bacteriology, Ministry of Agriculture and Rural Affairs, Nanjing 210014, Jiangsu, China
3 WOAH Reference Laboratory for Swine Streptococcosis, Nanjing 210014, Jiangsu, China
4 Guangdong Haid Institute of Animal Husbandry & Veterinary, Guangdong Provincial Key Laboratory of Research on the Technology of Pig-breeding and Pig-disease Prevention, Guangzhou 511400, Guangdong, China
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