The U.S. Food and Drug Administration has approved a new vaccine to prevent the seasonal flu.
FluMist Quadrivalent is the first vaccine to contain four strains of the influenza virus - two influenza A strains and two B strains. It is manufactured by Gaithersburg-based MedImmune LLC.
The new vaccine containst weakened forms of the virus strains and is administered by a spray into the nose.
Prior to approval of the new drug, other vaccines contained three strains of flu - two A and one B. The addition of a B strain increases the likelihood of protection, the FDA said.
Illnesses caused by the B virus are more likely to infect young, school-age children more than any other population, the FDA said.
The FDA said vaccine is the best prediction against influenza, which can be unpredictable and sometimes deadly.
FDA approves new flu vaccine
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