About the Authors

Zengqiang Kou

Contributed equally to this work with: Zengqiang Kou, Jing Jia, Xiaohui Liu

Roles Writing – original draft

Affiliation Shandong Center for Disease Control and Prevention, Jinan, China

Jing Jia

Contributed equally to this work with: Zengqiang Kou, Jing Jia, Xiaohui Liu

Roles Writing – original draft

Affiliation Department of Acute Infectious Disease, Qingdao Centre for Disease Control and Prevention, Qingdao Institute of Prevention Medicine, Qingdao, Shandong, China

Xiaohui Liu

Contributed equally to this work with: Zengqiang Kou, Jing Jia, Xiaohui Liu

Roles Investigation

Affiliation Department of Acute Infectious Disease, Qingdao Centre for Disease Control and Prevention, Qingdao Institute of Prevention Medicine, Qingdao, Shandong, China

Tingting Luo

Roles Methodology

Affiliation Department of Public Health, Qingdao University Medical College, Qingdao, Shandong, China

Xueling Xin

Roles Investigation

Affiliation Department of Acute Infectious Disease, Qingdao Centre for Disease Control and Prevention, Qingdao Institute of Prevention Medicine, Qingdao, Shandong, China

Jinling Gong

Roles Methodology

Affiliation Department of Acute Infectious Disease, Qingdao Centre for Disease Control and Prevention, Qingdao Institute of Prevention Medicine, Qingdao, Shandong, China

Jingfei Zhang

Roles Data curation

Affiliation Department of Acute Infectious Disease, Qingdao Centre for Disease Control and Prevention, Qingdao Institute of Prevention Medicine, Qingdao, Shandong, China

Dapeng Sun

Roles Writing – review & editing

792114402@qq.com (DS); jfch88@126.com (FJ); 1573503375@qq.com (RG)

Affiliation Shandong Center for Disease Control and Prevention, Jinan, China

Fachun Jiang

Roles Writing – review & editing

792114402@qq.com (DS); jfch88@126.com (FJ); 1573503375@qq.com (RG)

Affiliation Department of Acute Infectious Disease, Qingdao Centre for Disease Control and Prevention, Qingdao Institute of Prevention Medicine, Qingdao, Shandong, China

Ruqin Gao

Roles Writing – review & editing

792114402@qq.com (DS); jfch88@126.com (FJ); 1573503375@qq.com (RG)

Affiliation Department of Acute Infectious Disease, Qingdao Centre for Disease Control and Prevention, Qingdao Institute of Prevention Medicine, Qingdao, Shandong, China

Competing Interests

The authors have declared that no competing interests exist.