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Can a vaccination be given after symptoms present?

Updated: 8/17/2019
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15y ago

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Vaccinations work by injecting a small amount of a weakened or dead form of the disease you are preventing. This works because the bodies defenses learn how to kill the disease very quickly and can fight it off very easily the next time they encounter it.

If you tried to vaccinate a person who is already infected with the disease you are trying to prevent, than you would just be injecting more of the disease into a body that is already fighting the disease off.

For most diseases, actually becoming infected with the disease serves as a vaccination in itself. It works the same way, except that the body has a much harder time fighting the disease off, because the microorganisms that cause the disease clearly did not enter the body dead, as is the case with deliberate vaccinations.

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Q: Can a vaccination be given after symptoms present?
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