Main flu strain not matched to this year's vaccine - CBS News 8 - San Diego, CA News Station - KFMB Channel 8

Main flu strain not matched to this year's vaccine

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SAN DIEGO (CBS 8) - Flu season has not yet reached its peak, but the Centers for Disease Control says the virus is already widespread in 43 states.

Health experts say fighting the flu this year has been exceptionally difficult.

In this CBS News 8 Health Alert report, Marcella Lee explains why.

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