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.
(A) The proportion of specimens positive for influenza A (H1N1) virus by age groups. (B) The proportion of specimens positive for influenza A (H3N2) virus by age groups. (C) The proportion of specimens positive for influenza B virus by age groups. (D) The proportion of specimens positive for pandemic influenza A (H1N1) 2009 virus by age groups.
