Colored areas on the maps indicate confirmed cases. You can hover over them to view the number of confirmed cases reported by state or country. Note that these are the official numbers numbers from the World Health Organization and U.S. Centers for Disease Control and Prevention; some media outlets include unconfirmed cases in their reporting.
Cases Reported in the U.S. 38 states have officially reported 403 cases of influenza A(H1N1) infection. Source: Centers for Disease Control and Prevention (Last updated: May 5, 2009, 11:00 AM ET)