Unique Epidemiological Patterns and Origin of the Outbreak of Human Infection with H7N9 AIV in China from 2013 to 2015

Dezhong Xu^1*#, Yong Long^1#, Haixia Su¹, Lei Zhang¹, Yuhai Zhang², Xiaofeng Tang³, Yuxian Xu⁴, Jie Gao¹, Yang Zhang², Rui Xu¹, Bo Wang¹, Weilu Zhang¹, Liping Duan⁵ and Jielai Xia^2*

¹Department of Epidemiology and Clinical Epidemiological Unit, International Clinical Epidemiological Network, Fourth Military Medical University, Xian, China

²Department of Health Statistics, Fourth Military Medical University, Xian, China

³Out Patient Department, Fourth Military Medical University, Xian, China

⁴Department of Medical, The Armed Police General Hospital, Beijing, China

⁵Beidaihe Sanatorium of Beijing Military Region, China

^#Contributed equally to this work