Figure 1.

Phylogenetic analysis of the HA nucleotide sequence of some H5N1 strains. The A/great crested grebe/Basque Country.Spain/06* virus sequence was generated in this study. Phylogenetic analysis of the NA nucleotide sequence offered similar results with the A/great crested grebe/Basque Country.Spain/06* virus in a cluster that includes A/mallard/Italy/835/2006 and A/Cygnus olor/Czech Republic/5170/2006. The A/great crested grebe/Bavaria/22/2006 NA nucleotide sequence was not available.