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What is the best reason why people must be vaccinated once a year for influenza?

a. The vaccine is removed by the body after 12 months
b. The virus binds to all of the vaccine after a few months
c. The immune system only "remembers" vaccines for several months
d. The amount of vaccine decreases in blood after one year
e. The vaccine is made ineffective by viral antigenic shifting

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Category:- Biology
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