Why Is a Yearly Flu Shot Required to Help Prevent

question 53

Multiple Choice

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.

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