Testing the Effect of Internal Genes Derived from a Wild-Bird-Origin H9N2 Influenza A Virus on the Pathogenicity of an A/H7N9 Virus
Since 2013, avian influenza A(H7N9) viruses have diversified into multiple lineages by dynamically reassorting with Rugs other viruses, especially H9N2, in Chinese poultry.Despite concerns about the pandemic threat posed by H7N9 viruses, little is known about the biological properties of H7N9 viruses that may recruit internal genes from genetically