@nideo these people who come up with these vaccine conspiracies are con-artists and liars.

"""o Sometime around 1960, Simian Virus 40 (SV40) was discovered in the injected form of the polio vaccine (IPV).

o The SV40 virus has been found in certain types of cancer in humans.

o Between 1955 and 1963, when some portion of the IPV was contaminated with SV40, roughly 98 million Americans received at least one dose of polio vaccine.

Clearly 98 million Americans were not “given [a] cancer virus via the polio shot,” because not every single polio vaccination undertaken between the years of 1955 and 1963 involved vaccine contaminated with SV40: the CDC estimated that somewhere between 10 and 30 million Americans might have received SV40-contaminated vaccine during that period. Moreover, SV40 is not a “cancer virus,” and there is no definitive evidence that either SV40 itself or SV40-contaminated polio vaccine causes (or has caused) cancer.""

"All of the evidence to date indicates that after 1963, all vaccines on the U.S. market were free of SV40.

The majority of evidence suggests there is no causal relationship between receipt of SV40-contaminated polio vaccine and cancer development; however, some research results in this area are conflicting and more studies are needed. Since the discovery of SV40, several studies have been done to compare cancer rates in groups of individuals known or strongly presumed to have received SV40-contaminated polio vaccine to rates in persons known or strongly presumed not to have received SV40-contaminated vaccine.

In summary, the majority of studies in the U.S. and Europe that compare persons known or strongly presumed to have received SV40-contaminated polio vaccine with those known or strongly presumed not to have received SV40-contaminated polio vaccine have not shown a causal relationship between receipt of SV40-contaminated polio vaccine and cancer. It should be noted, however, that SV40 infection has been found in persons who did not receive SV40-contaminated polio vaccine and that for some study participants it cannot be known with certainty whether or not they received SV40-contaminated vaccine. Because of this, there may be errors in these studies that make it harder to detect a true increased cancer risk associated with receipt of SV40-contaminated polio vaccine."

https://www.snopes.com/cdc-admits-98-million-got-cancer-polio-vaccine/