The predominant strain of circulating flu this season continues to be influenza A H3N2, which typically poses bigger problems for young children and the elderly, according to the CDC. But, predominant strains can vary across states and regions of the country, the agency noted.
The 45 pediatric deaths so far compare to 153 deaths reported during the 2003-04 season, which was another H3N2 season, the agency said.
An estimated 36,000 people die from the flu and its complications in a typical season, according to the CDC. From 1976 to 2006, estimates of flu-associated deaths in the United States ranged from a low of about 3,000 to a high of about 49,000 people.
Flu season usually peaks in late January or early February.
The best defense against the flu remains the flu vaccine and it's not too late to get vaccinated, the CDC said. The agency recommends that everyone 6 months of age and older get vaccinated.
This year's vaccine appears to be well matched for the circulating flu strains, the CDC said. A recent report put the vaccine's effectiveness at 62 percent. No vaccine is 100 percent effective. But if flu strikes, vaccination often results in milder illness, the agency said.
People can visit this U.S. government website to see where vaccine is available in their area.
As of Jan. 25, 134.2 million doses of flu vaccine had been distributed to vaccine providers in the United States for the 2012-2013 season.
Two antiviral medications, Tamiflu and Relenza, can reduce flu symptoms and the course of the disease. To be effective, however, they must be started within 48 hours after symptoms appear.
Flu symptoms include fever, cough, fatigue, head and body aches, and runny nose. People at particular risk for flu and its complications are pregnant women, those 65 and older and anyone with a chronic illness. The CDC urges these people to
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