1. Hunan Provincial Center for Disease Control and Prevention (Workstation for Emerging Infectious Disease Control and Prevention, Chinese Academy of Medical Sciences), Changsha City, Hunan Province, People’s Republic of China
2. State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen City, Fujian Province, People’s Republic of China
3. Shaodong Municipal Center for Disease Control and Prevention, Shaodong City, Hunan Province, People’s Republic of China
4. Shaoyang Municipal Center for Disease Control and Prevention, Shaodong City, Hunan Province, People’s Republic of China
5. Department of Biostatistics, College of Public Health and Health Professions, Emerging Pathogens Institute, University of Florida, Gainesville, Florida, USA