Dec 30, 2013 12:59 PM by NBC News
We haven't hit the peak of flu season yet, but the virus is already widespread in ten states.
States in the south and south central region of the U.S. are experiencing the most flu activity right now, but every state has reported cases.
The number of people visiting the doctor is above average, and has increased for four weeks in a row.
The dominant strain is H1N1, which mostly affects young and middle age adults.
That strain is included in this year's flu vaccine, which experts say is the best way to protect yourself from the illness.
Officials with the Centers for Disease Control and Prevention recommend everyone over six months of age get a flu shot. They say it's not too late to get one now.
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