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Why must a person receive a different flu vaccine each year to be protected against the flu?

Why must a person receive a different flu vaccine each year to be protected against the flu?
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Why must a person receive a different flu vaccine each year to be protected against the flu?

User Ouadie
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1 Answer

6 votes
OK so basically the flu shot is a virus itself and we need a different one each time so that we do not become immune.
User Viviana
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