[1] Capital Med Univ, Inst Resp Med, Beijing Hosp, Natl Hlth & Family Planning Commiss, Beijing, Peoples R China
[2] Capital Med Univ, Dept Resp Med, Beijing, Peoples R China
[3] Chinese Ctr Dis Control & Prevent, Beijing Inst Resp Med, Beijing, Peoples R China
[4] Chinese Ctr Dis Control & Prevent, Beijing Key Lab Resp & Pulm Circulat Disorders, Beijing, Peoples R China
[5] Chinese Ctr Dis Control & Prevent, Div Infect Dis, Key Lab Surveillance & Early Warning Infect Dis, Beijing, Peoples R China
[6] Univ Oxford, Clin Res Unit, Wellcome Trust Major Overseas Programme, Hanoi, Vietnam
[7] Univ Oxford, Nuffield Dept Clin Med, Ctr Trop Med, Oxford, England
[8] Capital Med Univ, Singapore Infect Dis Initiat, Beijing, Peoples R China
[9] Capital Med Univ, Beijing Inst Resp Med, Beijing Chao Yang Hosp, Beijing, Peoples R China
[10] Univ Hong Kong, Li Ka Shing Fac Med, Sch Publ Hlth, Div Epidemiol & Biostat, Hong Kong, Hong Kong, Peoples R China
[11] Collaborat Innovat Ctr Diag & Treatment Infect Di, Hangzhou, Zhejiang, Peoples R China
[12] Zhejiang Univ, Affiliated Hosp 1, State Key Lab Diag & Treatment Infect Dis, Dept Infect Dis,Coll Med, Hangzhou 310003, Zhejiang, Peoples R China
[13] Peking Univ, Peoples Hosp, Dept Resp & Crit Care Med, Beijing 100871, Peoples R China
[14] Natl Hosp Trop Dis, Hanoi, Vietnam
[15] Natl Hosp Pediat, Hanoi, Vietnam
[16] Hosp Trop Dis, Ho Chi Minh City, Vietnam
[17] Univ Oxford, Churchill Hosp, Ctr Trop Med, ISARIC, Oxford, England
[18] Ctr Dis Control & Prevent, Influenza Div, Natl Ctr Immunizat & Resp Dis, Atlanta, GA USA