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Doctors sometimes use a vaccine to help prepare the body to defend itself against future infections. These vaccines most often contain

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The answer is dead or weakened virus
User Matt Ghafouri
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Answer: weakened pathogens

Step-by-step explanation:

Each vaccine contains a small amount of the disease germ (virus or bacteria) or parts of the germ.

A pathogen is a bacterium, virus, or other microorganism that can cause disease.

User KeyKi
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