1. National Institute for Viral Disease Control and Prevention, Collaboration Innovation Center for Diagnosis and Treatment of Infectious Diseases, Chinese Center for Disease Control and Prevention, Key Laboratory for Medical Virology, National Health and Family Planning Commission, Beijing 102206, China
2. Guangxi Center for Disease Prevention and Control, Nanning 530028, China
3. Hunan Provincial Center for Disease Control and Prevention, Changsha 410005, China