... CHARACTERISTIC OF PB2, PB1 AND PA GENES OF THE HUMAN A INFLUENZA VIRUS 1.2.1 A influenza pandemics in the past 1.2.2 Variational characteristic of PB2, PB1 and PA of the human A influenza virus 1.3 ... PB2, PB1 and PA genes 1.1.5 The polymerase complex of the A influenza virus 1.1.6 Genetically variation characteristic of genes and the genome A influeza virus 1.2 A INFLUENZA PANDEMIC AND VARIATIONAL ... A/H5N1 virus strain of the world Results of analysing and determining phylogenetic relationships: PB2, PB1 and PA genes of A/H5N1 strains in this study and virus strains of Vietnam, originate in...