The Center for Disease Control (CDC) Admits the Polio Vaccine May Cause Cancer!
SV40 is a virus found in some species of monkey.
SV40 was discovered in 1960. Soon afterward, the virus was found in polio vaccine.
More than 98 million Americans received one or more doses of polio vaccine from 1955 to 1963 when a proportion of vaccine was contaminated with SV40; it has been estimated that 10–30 million Americans could have received an SV40 contaminated dose of vaccine.
SV40 virus has been found in certain types of cancer in humans, but it has not been determined that SV40 causes these cancers.
Polio vaccines being used today do not contain SV40. All of the current evidence indicates that polio vaccines have been free of SV40 since 1963. Editor’s note: This claim by the CDC is false.  SV40-contaminated oral polio vaccines were produced from early 1960s to about 1978 and were used throughout the world.
In the 1950s, rhesus monkey kidney cells, which contain SV40 if the animal is infected, were used in preparing polio vaccines. Because SV40 was not discovered until 1960, no one was aware in the 1950s that polio vaccine could be contaminated.
SV40 was found in the injected form of the polio vaccine (IPV), not the kind given by mouth (OPV).  (Editor’s note: this claim by the CDC is patently false . SV40 was found in oral polio vaccines after 1961. A study determined that the procedure used by the manufacturer to inactivate SV40 in oral poliovirus vaccine seed stocks based on heat inactivation in the presence of MgCl2 did not completely inactivate SV40.).
Not all doses of IPV were contaminated. It has been estimated that 10–30 million people actually received a vaccine that contained SV40.
Some evidence suggests that receipt of SV40-contaminated polio vaccine may increase risk of cancer. However, the majority of studies done in the U.S. and Europe which compare persons who received SV40-contaminated polio vaccine with those who did not have shown no causal relationship between receipt of SV40-contaminated polio vaccine and cancer. (Editor’s note: Oh really? SV40 has already been detected in some human tumors. That is far and beyond “some evidence”.)
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