Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Phylogenetic analysis of HA segment of clade 2.2 H5N1 influenza viruses. Topology of phylogenetic relationship of studied 873 HA genes in four routes is shown by different color associated with its corresponding route. The phylogenetic tree is rooted by Gs/Gd/96 isolate with three possible sources shown in grey with country names annotated. Bootstrap values greater than 60 are marked at corresponding branches.
