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A 29-year-old male asked:

Is the flu shot still effective in the off season (summer)/temporary, or forever for those strains that imune sys learns? forgot to get it in winter.

1 doctor answer1 doctor weighed in
Dr. Dean Giannone
Internal Medicine 25 years experience
Actually forever.: Fact is, the flu vaccine you receive in a given season will afford you lifetime protection against the strains of flu that are in that vaccine. The annual requirement is not because the shot wares off, but rather the strains we need to address change every year.

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Last updated Jan 16, 2016

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