Figure 2From: The antigenic property of the H5N1 avian influenza viruses isolated in central ChinaPhylogenetic analysis of HA gene of the 10 viruses. The phylogenetic tree was build with the program MEGA 4.1. Clades of H5N1 virus were classified according to nomenclature recommended by WHO evolution working group. The viruses used in present study were labeled by red spot.Back to article page