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Infant receiving polio vaccine. CDC Global / CC BY 2.0

By Vanessa Schipani, FactCheck.org

Q: Did people develop cancer because of the polio vaccine?

A: There are no known cases, and it's very unlikely. In the 1950s and 1960s, people did receive polio vaccines contaminated with a virus that causes cancer in rodents. But research suggests this virus doesn't cause cancer in humans.

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