
Manipulation of neuraminidase packaging signals and hemagglutinin residues improves the growth of A/Anhui/1/2013 (H7N9) influenza vaccine virus yield in eggs
Keywords: Influenza A H7N9 virus; Vaccine virus; Packaging signals; Chimeric NA; Egg adaptation; H7 HA egg-adaptive mutations; HA; hemagglutinin; NA; neuraminidase; WT; wild-type; CVV; candidate vaccine virus; ORF; open reading frame; NCR; non-coding region; nt; nu