Zhou, Lei, Ruiqi Ren, Lei Yang, Changjun Bao, Jiabing Wu, Dayan Wang, Chao Li, Nijuan Xiang, Yali Wang, Dan Li, Haitian Sui, Yuelong Shu, Zijian Feng, Qun Li, and Daxin Ni. “Sudden Increase in Human Infection With Avian Influenza A(H7N9) Virus in China, September-December 2016”. Western Pacific Surveillance and Response 8, no. 1 (April 3, 2017). Accessed May 2, 2024. https://ojs.wpro.who.int/ojs/index.php/wpsar/article/view/521.