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The polio virus cannot live in an immunized individual, and we have Jonas Salk to thank. In 1953, he injected himself, his family, and other volunteers with the polio virus.

User Adam Vincze
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1 Answer

28 votes
28 votes

Answer:

it could be why polo is here because of sickness

Step-by-step explanation:

how do i know? because i kniow

User Marko Jurisic
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