How Effective is this Year's Flu Shot?

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By Molly Clifton

This season's flu shot is only protecting seniors from the most dangerous flu strain 9 percent of the time.

A government report says the vaccine is 56 percent effective for all age groups, which is a typical result.

Researchers say the 9 percent in seniors is much lower than anticipated, and they're not sure why the vaccine isn't working as well expected.
 



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