Emergence of H3N8 avian influenza viruses possessing tri-basic hemagglutinin cleavage sites in China. Issue 4 (October 2022) - Wen, Feng; Zhang, Xingyu; Guo, Jinyue; Liang, Zhipeng; Cheng, Qing; Wang, Congying; Yu, Hai; Du, Yuguang; Huang, Shujian; Li, Jianjun; Li, Yong