Cancer, Simian Virus 40 (SV40), and Polio Vaccine Fact Sheet

Centre for Disease Control and Prevention Statement Reproduced Below:

  • 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.
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