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A member asked:
What is the half life of a flu shot?
A doctor has provided 1 answer
Lasts through season: I'm not sure if you're asking when it will kick in, or how long it lasts... Flu shots are good for the season, since they're geared to the expected strains. They don't "wear off" so much as fail to cover the strains coming out the next fall. It takes a couple weeks for the immunity to kick in, but they should last a long while; new shot needed every fall due to new strains.
Answered 8/28/2019
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