Fudan University - Key Laboratory of Medical Molecular Virology (MOE/NHC/CAMS), Fudan University - Key Laboratory of Medical Molecular Virology (MOE/NHC/CAMS), Guangxi Center for Disease Control and Prevention, Fudan University, Zhengding County Center for Disease Control and Prevention, Fudan University - Key Laboratory of Medical Molecular Virology (MOE/NHC/CAMS), Fudan University - Key Laboratory of Medical Molecular Virology (MOE/NHC/CAMS), Zhengding County Center for Disease Control and Prevention, Fudan University - Key Laboratory of Medical Molecular Virology (MOE/NHC/CAMS), Hebei Center for Disease Control and Prevention, Fudan University, Fudan University, Government of the United States of America - Centers for Disease Control and Prevention (CDC), Cincinnati Children's Hospital Medical Center - Division of Infectious Diseases, Guangxi Center for Disease Control and Prevention, Hebei Center for Disease Control and Prevention and Fudan University - Key Laboratory of Medical Molecular Virology (MOE/NHC/CAMS)