Why are new flu vaccines prepared each year?
A) The vaccine wears off, so we need a booster.
B) Microorganisms are constantly mutating.
C) Our immune system needs a "jump start."

Name: Why are new flu vaccines prepared each year? A) The vaccine wears off, so we need a booster. B) Microorganisms are constantly mutating. C) Our immune system needs a "jump start."
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Question

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Microorganisms are constantly mutating, so new flu vaccines are prepared each year to protect against the most recent strains.

Why Are New Flu Vaccines Prepared Each Year