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A member asked:
I'm curious as to how long is the flu shot effective?
A doctor has provided 1 answer
Define effective: The flu strains mutate often. Each year the predominant strains change. The flu vaccine is developed yearly using 3 strains that are circulating and already causing flu in so many places that a they are expected to continue.The vaccine stimulate production of antibodies to the included strains that last for years. However, the flu mutates so often, the benefit can be limited to one season.
Answered 12/10/2013
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Related Questions
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Is there evidence as to whether the flu shot was an effective match this year?
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News reports say flu at epidemic level now and flu shot not very effective this year. Got my shot in early Oct. What else can I do to protect myself?
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How effective are flu shots? Do they really protect you from the flu?
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