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 tree of H1N1pdm09 influenza A virus (A/swine/Nigeria/12VIR4047/2011) isolated in Nigeria (HA, NA, MA, PB1, PB2, PA, NS and NP genes). In red colour are swine isolates from Nigeria while blue colour represents human isolates from Nigeria.
