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FDA approves first 4-in-1 flu vaccine
FDA approves first vaccine to protect against 4 strains of common flu virus
By The Associated Press

WASHINGTON (AP) ' Federal health officials have approved the first vaccine that protects against four strains of the common flu, offering one additional layer of protection against the influenza virus.

The Flumist Quadrivalent vaccine from MedImmune protects against two strains of influenza A and two strains of influenza B.

Previously all vaccines contained two strains of influenza A and one strain of influenza B, chosen annually by medical experts based on their potential to spread through the population. Having an extra strain of influenza B increases the likelihood that the vaccine will protect against illness, the FDA said in a statement.

Similar to the previously approved Flumist, the new vaccine is a nasal spray that delivers weakened strains of the virus.

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