[1] Xiamen Univ, Natl Inst Diagnost & Vaccine Dev Infect Dis, Xiamen 361005, Peoples R China
[2] Chinese Ctr Dis Control & Prevent, Inst Viral Dis Control & Prevent, Beijing, Peoples R China
[3] Guangxi Ctr Dis Control & Prevent, Nanning, Peoples R China
[4] Beijing Wantal Biol Pharm Enterprise Co Ltd, Beijing, Peoples R China
[5] Fudan Univ, Sch Publ Hlth, Shanghai 200433, Peoples R China