Wen F, Chen G, Guo J, Guan M, et al. Identification of a duck H9N2 influenza virus possessing tri-basic hemagglutinin
cleavage sites genetically close to the human H9N2 isolates in China, 2022. J Infect 2023 Apr 17:S0163-4453(23)00207-4. doi: 10.1016/j.jinf.2023.
PMID: 37075911