According to the Center for Disease Control (CDC), H1N1 has infected about 57 million Americans since April 2009. The age group hardest hit was the 18-64 year olds which made this influenza outbreak different than earlier ones.
The CDC provides a weekly update on flu activity and for this past week the number of people infected with the virus decreased nationally. Most states however, are still reporting some cases of H1N1. So while the number of cases are down, this flu has not totally subsided.
Source: www.cdc.gov/H1n1flu/update
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