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A member asked:
How does smallpox vaccine work?
A doctor has provided 1 answer
Coxpox immunity: The smallpox vaccine contains live vaccinia, the virus that causes cowpox. Vaccinia is related to smallpox but causes a much milder form of disease. By exposing your immune system to vaccinia, you develop immunity both to vaccinia and also to the smallpox virus.
Answered 12/29/2022
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