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.