I think a quick google search has steered you wrong. I don't think this is a huge story (I've never heard of SV40 before reading this thread), but just a little

I think a quick google search has steered you wrong. I don't think this is a huge story (I've never heard of SV40 before reading this thread), but just a little deeper...reading the executive summary, the story seems less clear cut. "The committee concludes that the biological evidence is moderate that SV40 exposure could lead to cancer in humans under natural conditions." And there's more. SV40's probably also transformative (observed in both mammals and humans) and the vaccine has moderate evidence of causality. Then there's the strange disappearance of the CDC page awhile back - http://www.laleva.org/eng/2013/07/cdc_disappears_page_linking_polio_vaccines_to_cancer-causing_viruses.html http://www.laleva.org/eng/2013/07/cdc_disappears_page_linkin... And the papers correlating the virus to cancer: https://pubmed.ncbi.nlm.nih.gov/10472327/ https://pubmed.ncbi.nlm.nih.gov/10472327/ https://pubmed.ncbi.nlm.nih.gov/16966607/ https://pubmed.ncbi.nlm.nih.gov/16966607/ etc