Question

What are vaccines? Answer Briefly.
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Answer 1

Answer:

A vaccine is an inactivated form of bacteria or virus that is injected into the body to simulate an actual infection. Because the injected microorganisms are 'dead,' they don't cause a person to become sick. Instead, vaccines stimulate an immune response by the body that will fight off that type of illness

Explanation:

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Answer 2

Answer:

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