1. Key Laboratory of Bio-Resource and Eco-Environment, Ministry of Education, Key Laboratory of Animal Disease Prevention and Food Safety of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, Sichuan 610065, P.R. China
2. School of Laboratory Medicine, Chengdu Medical College, Chengdu, Sichuan 610500, P.R. China
3. College of Bioengineering, Sichuan University of Science & Engineering, Zigong, Sichuan 643000, P.R. China
4. Sichuan Academy of Animal Science, Chengdu, Sichuan 610066, P.R. China
5. Center for Animal Disease Control of Sichuan Province, Chengdu, Sichuan 610035, P.R. China