Figure 4.
Distribution of novel influenza A (H1N1) by age group, Xiamen, June 14, 2009-March 22, 2010.
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.