seasonal flu vaccines; however, they are insufficient for vaccines against some human-fatal
H5N1 highly pathogenic avian influenza (HPAI) viruses (HPAIV) due to low productivity.
Additionally, the polymerase basic 2 (PB2) protein, an important mammalian-pathogenicity
determinant, of PR8 possesses several mammalian-pathogenic mutations. We previously
reported two avian PB2 genes (01310 and 0028) related to efficient replication in …