About the Authors
Shanghai Public Health Clinical Center and Institutes of Biomedical Sciences, Key Laboratory of Medical Molecular Virology of Ministry of Education/Health at Shanghai Medical College, Fudan University, Shanghai, China
State Key Laboratory of Infectious Disease Control and Prevention (CDC), Beijing, China
The authors have declared that no competing interests exist.
Performed the experiments: YA ZM. Analyzed the data: YA. Wrote the manuscript: YA. Revised the manuscript: JX. Conceived the study: JX. Designed the experiments: JX XZ.