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People do get it from vaccines. The only polio vaccine that prevents you from giving it to others is live polio. If you give a bunch of people the live polio vaccine, some of them will get polio. Since polio hardly exists in the wild anymore, as we're close to eradicating it with the polio vaccine, the main way people get polio is the polio vaccine.
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That's what I recall having read, too.
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