Flu season strikes U.S.

Associated Press
Pam Horn administers the flu vaccine to employee Michael Karolitzky at Philly Flu Shots on Thursday, Jan. 10, 2013, in Philadelphia. The flu season arrived early in the U.S. this year, but health officials and experts say it's too early to say this will be a bad one. Experts say evidence so far is pointing to a moderate flu season - it just looks worse because last year's season was so mild. Flu usually doesn't blanket the country until late January or February. Now, it's already widespread in more than 40 states. That could change when the next government report comes out Friday. (AP Photo/Matt Rourke)

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Flu season in the U.S. has struck early and, in many places, hard. From the Rocky Mountains to New England, hospitals are swamped with people with flu symptoms. Boston declared a public health emergency, with the city's hospitals counting about 1,500 emergency room visits since December by people with flu-like symptoms.

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