About the Authors
State Key Laboratory for Infectious Disease Prevention and Control, Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People's Republic of China
State Key Laboratory for Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, Hubei, People's Republic of China
Department Of Epidemiology and Health Statistics, School of Public Health, Shandong University, Jinan, People's Republic of China
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JNY HL QT XYT SMW GDL. Performed the experiments: JNY XYT HL. Analyzed the data: JNY QT SR JA NH WF XYT ZYG HZL. Contributed reagents/materials/analysis tools: QT GDL SR NH HZL. Wrote the paper: JNY SR NH JA XYT QT.