Phylogenetic tree analysis
The coding region of the NS1 gene from
35 different H5N1 influenza virus samples from
this study and another 11 NS1 genes of H5N1
influenza viruses obtained from the GenBank
database were used for phylogenetic analysis
(Fig 1). The results reveal there were 35 NS1
genes located on allele A. The NS1 gene for
H5N1 viruses isolated in Thailand could be
divided into two different subgroups.