[1] Shanghai Pudong New Area Ctr Dis Control & Preven, Key Lab Surveillance & Early Warning Infect Dis C, Res Base, 3039 Zhangyang Rd, Shanghai 200136, Peoples R China
[2] Fudan Univ, Pudong Inst Prevent Med, 3039 Zhangyang Rd, Shanghai 200136, Peoples R China
[3] Ctr Dis Control & Prevent, Pudong New Area, Microbe Test Sect, 3039 Zhangyang Rd, Shanghai 200136, Peoples R China
[4] Ctr Dis Control & Prevent, Dept Infect Dis, Pudong New Area, 3039 Zhangyang Rd, Shanghai 200136, Peoples R China