evidence: CLAIM: The Centers for Disease Control and Prevention admitted that 98 million Americans were given a "cancer virus" through the polio vaccine. AP’S ASSESSMENT: False. The CDC has made no such statement, and the claim misrepresents a fact sheet put out by the agency more than 10 years ago about some polio vaccines that were administered between 1955 to 1963. The agency has said that that 10-30% of the 98 million shots administered in that period were contaminated with simian virus 40, or SV40, but that most studies have found no causal relationship between SV40 and cancer in humans. [...] "CDC admits 98 million Americans were given cancer virus via the polio shot," reads the article’s headline.