1. College of Veterinary Medicine, Jilin University, Changchun, People’s Republic of China
2. Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, People’s Republic of China
3. Section of Paediatric Infectious Diseases, Imperial College London, London, UK
4. School of Basic Medicine, Jilin University, Changchun, People’s Republic of China
5. College of Animal Science, Yangtze University, Jingzhou, Hubei, People’s Republic of China