1. College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi Province, People’s Republic of China;
2. State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining, Qinghai Province, People’s Republic of China;
3. Animal Diseases Control & Prevention Centre of Guanling Autonomous County, Anshun, Guizhou province, People’s Republic of China;
4. Animal Diseases Control & Prevention Centre of Qiannan, Duyun, Guizhou province, People’s Republic of China