1. Institute of Traditional Chinese Veterinary Medicine, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, P.R. China
2. MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, P.R. China
3. College of Veterinary Medicine, Xinjiang Agricultural University, Urumqi, 830000, China