Why are new flu vaccinations required for each new flu season instead of developing a universal flu vaccine?
A) The vaccination cannot contain enough preservatives to last in the body longer than a year.
B) The flu virus mutates frequently enough that last year's vaccination will no longer target currently circulating flu strains.
C) The flu virus can become latent, meaning it can hide from the immune system within the body, so new vaccinations are important to allow for continuing immunity.
D) The vaccination does not contain enough antigens to create a lasting immune response, so boosters are required every year.
Correct Answer:
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