influenza vaccine live intranasal; FluMist, FluMist Quadrivalent

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GENERIC NAME: influenza vaccine live, intranasal

BRAND NAME: FluMist, FluMist Quadrivalent

DRUG CLASS AND MECHANISM: FluMist is a nasal vaccine that protects against infection with the influenza virus or the "flu." FluMist contains live influenza virus that has been weakened so that it causes minimal or no symptoms. When FluMist is inhaled, the body responds to the weakened viruses in FluMist by developing antibodies that fight influenza viruses. These antibodies protect against later infections by the naturally-occurring influenza virus. FluMist is effective only against the strains of influenza virus that are included in it, and the strains of virus change from year to year. FluMist has no effect on the flu once infection has begun. FluMist should be given shortly before the flu season begins to allow time for antibodies to be produced and for protection throughout the entire flu season. FluMist and FluMist Quadrivalent are similar except for the addition of one additional virus strain to Flumist Quadrivalent. FluMist is a trivalent vaccine because it has three flu virus strains (two type A viruses and one B type) and FluMist Quadrivalent has four virus strains (two A type and two B types). FluMist and FluMist Quadrivalent do not prevent 2009 H1N1 (swine flu) virus infection. The FDA approved FluMist in June 2003 and FluMist Quadrivalent in February 2012.

Medically Reviewed by a Doctor on 1/27/2014



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