evidence: FULL CLAIM: "Did vaccines get rid of polio? The answer is NO!"; "Between 1955 - 1963 CDC admits 98 million Americans received the polio vaccine in an 8-year span when it was contaminated with the cancer-causing virus SV 40"; "The rise and fall of polio does actually correspond with the usage of DDT [...] Is it possible that many cases of polio were actually DDT poisoning? Is it possible that the decrease in DDT was a contributing factor in the decrease in polio cases?" An Instagram post claims that vaccines did not get rid of polio and, "between 1955–1963 [the] CDC admits 98 million Americans received the polio vaccine in an 8-year span when it was contaminated with the cancer-causing virus SV40." The post, which contains a video, was published on 2 December 2020, and received more than 35,000 views. The video also claims that "The rise and fall of polio does actually correspond with the usage of DDT [a type of pesticide]." Using the rhetorical technique of "just asking questions," the video suggests that "many cases of polio were actually DDT poisoning." [...] The claim that the vaccine once contained a cancer-causing virus is misleading and unsupported by scientific evidence. Health Feedback also addressed this claim in an earlier review. The U.S. Centers for Disease Control and Prevention explained: