About the Authors

Renqing Li

Contributed equally to this work with: Renqing Li, Qinghua Zou

lirenqingz@sina.com

Affiliation Beijing Center for Disease Control and Prevention, Beijing, China

Qinghua Zou

Contributed equally to this work with: Renqing Li, Qinghua Zou

Affiliation Department of Microbiology, Peking University Health Science Center, Beijing, China

Lijuan Chen

Affiliation Beijing Center for Disease Control and Prevention, Beijing, China

Herun Zhang

Affiliation Beijing Center for Disease Control and Prevention, Beijing, China

Yumei Wang

Affiliation Beijing Center for Disease Control and Prevention, Beijing, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RQL QHZ. Performed the experiments: LJC HRZ YMW. Analyzed the data: RQL QHZ. Wrote the paper: RQL QHZ.