This season’s flu vaccine may not be as effective against new and possibly more virulent strains of the virus that could become the nation’s dominant form of influenza in the young flu season.

The emergence of a mutated flu virus has caused the Centers for Disease Control and Prevention to issue a national health advisory urging caregivers to prescribe the antiviral medications Tamiflu and Relenza to suspected flu patients, even before they’ve been confirmed to have the virus.


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