Yanfang Cui, Yulei Li, Minghui Li, Lu Zhao, Deli Wang, Jingman Tian, Xiaoli Bai, Yanpeng Ci, Shanshan Wu, Fei Wang, Xiaomei Chen, Shujie Ma, Zhiyuan Qu, Cen Yang, Liling Liu, Jianzhong Shi, Yuntao Guan, Xianying Zeng, Guobin Tian, Pengfei Cui, Guohua Deng, Yongping Jiang, Pucheng Chen, Jinxiong Liu, Xiurong Wang, Hongmei Bao, Li Jiang, Yasuo Suzuki, Chengjun Li, Yanbing Li, Hualan Chen
Emerg Microbes Infect. 2020 Jul 20;1-0. doi: 10.1080/22221751.2020.1797542. Online ahead of print.
Lethal infection of wild birds with different subtypes of H5 viruses continuously occur. To investigate the genetic evolution and pathogenicity of H5 viruses in wild birds, we performed a detailed genetic and biologic analysis of 27 viruses, including H5N1, H5N2, H5N6, and H5N8 subtypes, that were responsible for avian influenza outbreaks in wild birds in China over the past decade. We found that these 27 viruses, bearing different clades/subclades of HA, were complicated reassortants and formed 12 different genotypes. Ten of the viruses tested were highly pathogenic in chickens, but showed distinct pathotypes in ducks and mice. Five of these 10 viruses, which were all from clade220.127.116.11, could bind human-type receptors. Our findings reveal the diversity of the genetic and biologic properties of H5 viruses circulating in wild birds and highlight the need to carefully monitor and evaluate the risks these viruses pose to animal and public health.
Keywords: H5 subtype; Influenza A virus; reassortant; virulence; wild birds.