1. CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China.
2. College of Animal Sciences and Veterinary Medicine, Guangxi University, Nanning 530004, China.
3. College of Animal Science and Technology, Shihezi University, Shihezi 832003, China.
4. University of Chinese Academy of Sciences, Beijing 100049, China.