Why is a yearly flu shot required to help prevent the symptoms of the flu?
A) to initiate a primary immune reaction
B) to help the innate immune system fight the virus
C) because small changes in the flu virus occur every year that are not recognized by the immune system
D) both to initiate a primary immune reaction and because small changes in the flu virus occur every year that are not recognized by the immune system
E) None of the answers are correct.
Correct Answer:
Verified
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