Figure 1
From: Host shifts and molecular evolution of H7 avian influenza virus hemagglutinin
Maximum likelihood consensus tree derived from 414 H7 HA nucleotide sequences. Computations were realized with the GTR+I+Г evolutionary model and 100 bootstrap replications (I = 0.27; α = 0.85). Tip colors represent the geographic origin of viruses: dark blue: Europe; light blue: Australia; green: Asia; yellow: Africa; purple: South America; orange: North America. Internal branches were also colored for monophyletic groups (i.e., same continent). Tips were annotated with red stars for HP viruses. A detailed phylogenetic tree including virus strain names is available in Figure S3.