1. Key Laboratory of Animal Bacteriology, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, Jiangsu 210095, P.R. China
2. Division of Animal and Plant Quarantine Supervision, Suzhou Entry Exit Inspection and Quarantine Bureau, Suzhou, Jiangsu 215021, P.R. China
3. College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei 430070, P.R. China
4. Animal, Plant and Food Inspection Center, Jiangsu Entry Exit Inspection and Quarantine Bureau, Nanjing, Jiangsu 210001, P.R. China
5. The Inspection and Quarantine Technology Center, Inner Mongolia Entry Exit Inspection and Quarantine Bureau, Hohhot, Inner Mongolia 010020, P.R. China