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A 46-year-old member asked:

Long does a flu shot last usually?

1 doctor answer2 doctors weighed in
Dr. Joseph Roosth
Internal Medicine 37 years experience
A year: Good question. The influenza virus mutates rapidly so each year's vaccine varies as each year's vaccine is based on the most prevalent flu strains from the last flu season. The actual immunity derived from a given flu shot probably lasts more than one year, but it is important to get a new shot each year, due to the changes.
Created for people with ongoing healthcare needs but benefits everyone.

Similar questions

Dayton, OH
A 38-year-old female asked:

How long does the side effects last after receiving a flu shot?

1 doctor answer1 doctor weighed in
Dr. Edgar Mendizabal
Internal Medicine 57 years experience
3 days: Shoulder discomfort might a little longer.
Created for people with ongoing healthcare needs but benefits everyone.

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Last updated Apr 25, 2015
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