Question: It is often said that a vaccine does not prevent infection; rather, it primes the immune system to undergo an immediate response to prevent an

It is often said that a vaccine does not prevent infection; rather, it primes the immune system to undergo an immediate response to prevent an infection from spreading. Explain what is meant by this statement, and outline what is happening at the cellular/molecular level from the time of vaccination until subsequent contact with the infectious agent actually occurs.

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