Keywords: Polio Vaccine SV40 and Cancer Factsheet.png en It has been estimated 10-30 million Americans could have received a polio vaccine contaminated with SV40 a monkey virus which has been found in certain types of cancer in humans 2007-10-22 http //www cdc gov/ Centers for Disease Control and Prevention PD-USGov Uploaded with UploadWizard Polio vaccine Cancer |