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Apr 25, 2018, 11:46 am75 ptsEcoWatch
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…
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