how long does a flu shot last?

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  • 1 decade ago
    Favorite Answer

    The immunity from the flu shot really lasts your lifetime. The formulation for the flu vaccine is different every year, so you are only being inoculated for the strain that the scientists think will be the most prevalent strain in that year. The flu is a very changeable virus, that is why you need a yearly flu shot.

  • Anonymous
    1 decade ago

    I say a week

    Love Dakota Fanning

  • 1 decade ago

    Not long.

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