1. State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, P. R. China
2. Division of Infectious Diseases, School of Medicine, Global Health Institute, Duke University, Durham, North Carolina
3. Global Health Research Center, Duke-Kunshan University, Kunshan, P. R. China
4. Program in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore
5. China Animal Health and Epidemiology Center, Ministry of Agriculture, Qingdao, P. R. China