WASHINGTON - Influenza is circulating unusually early this year with cases in all 50 states — nearly all the swine flu variety, government health officials said Friday.
The highest concentration of flu cases is in the Southeast and a few other states, Dr. Anne Schuchat of the Centers for Disease Control and Prevention said at a briefing.
The good news is that testing of vaccines for swine flu show that they work with a single dose and take effect rapidly.
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