The polymerase genes of the other 2 virus strains, A / Chicken / VietNam / DT382/2008 (H5N1) and A / Duck / VietNam / TG926/2009 (H5N1) (clade 1.1), derived from the Z genotype of the A / H5N1 influenza virus genome source, that generated in China during 2002 - 2003 period.