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WSJ: CDC sets stage for a four-strain flu shot for the next flu season
NEW YORK — The Centers for Disease Control and Prevention last week set the stage for the first quadrivalent influenza vaccine to be introduced in the 2013-2014 flu season, according to a report in The Wall Street Journal.
Quadrivalent vaccines will contain two A strains and two B strains of flu. The triumvirate vaccines in use today contain two A strains and one B strain of flu.