The CDC has admitted that between 1955–1963 over 98 million Americans received one or more doses of a polio shot which was contaminated with a cancer-causing virus called Simian vacuolating virus 40 (SV40). The CDC quickly took down the page, along with Google, but the site was luckily cached and saved to symbolize this grand admission.
“I think to release certain information is not a public service. There’s too much scaring the public unnecessarily. Oh, your children were injected with a cancer virus and all that. That’s not very good!” — Albert Sabin, polio vaccine researcher