Southern Medical University - Department of Infectious Diseases, Southern Medical University - Department of Infectious Diseases, Southeast University, Capital Medical University - Beijing YouAn Hospital, Government of the People's Republic of China - Fifth Medical Centre, Southern Medical University - Fifth Affiliated Hospita, Southern Medical University - Department of Gynaecology and Obstetrics, Southern Medical University - Department of Gynaecology and Obstetrics, Jiujiang Maternal and Child Care Center, Southern Medical University, Zhujiang Hospital, Third People’s Hospital of Jiujiang, Southern Medical University - Third Affiliated Hospital, Guangzhou Medical University - Guangzhou Eighth People's Hospital, Southern Medical University - Department of Infectious Diseases, World Health Organization (WHO) - Western Pacific Region (WPRO), World Health Organization (WHO), Peking University, School of Public Health, Department of Laboratorial Science and Technology, Peking University - Department of Microbiology and Infectious Disease and Southern Medical University - State Key Laboratory of Organ Failure Research