Why Are New Flu Shots Necessary Every Year

question 18

Multiple Choice

Why are new flu shots necessary every year?

• A) Depending on the year, either bacteria or viruses cause the flu.
• B) The antiviral chemicals in flu shots last only 11 months.
• C) Flu shots do not result in the production of memory cells.
• D) Flu viruses have a high mutation rate.

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