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.
Diversity of emerging influenza viruses associated with human infection. Confirmed or presumed (serologic evidence only) cases of avian influenza virus infection in humans since 1996. *, includes cases with serologic evidence only. Red border surrounding H5N1 human cases from 2003 to present indicates that there is substantial clade-specific and geographic diversity among this virus subtype not represented in this image (Abdel-Ghafar et al. 2008)
