What has research found regarding the health effects of receiving SV40-contaminated vaccine?
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. A brief description of some of these studies follows.
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