Figure 1. Distribution of Reports of Cases of H1N1 Influenza.
Data were collected by HealthMap during the first wave of the 2009 epidemic (April 1 through August 29, 2009) and were classified according to World Health Organization (WHO) phase.
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.