Who received SV40-contaminated polio vaccine in the U.S.?
More than 98 million Americans received one or more doses of IPV (the injected form of the polio vaccine) during the period (1955–1963) when some of the vaccine was contaminated with SV40. However, not all doses of IPV were contaminated. It has been estimated that 10–30 million of the 98 million people who received a polio shot actually received a vaccine that contained SV40 (Shah and Nathanson, 1976). In addition, about 10,000 volunteers who received an experimental oral polio vaccine (OPV) between 1959–1961 may have been exposed to SV40 (the vaccine was later licensed in 1963, subsequent to SV40 removal from the seed stock). All of the evidence to date indicates that after 1963, all vaccines on the U.S. market were free of SV40.
Related Questions
- If the child had already received polio vaccine through routine immunization or in previous NIDs, should this child be given the polio drops in forthcoming NIDs too?
- Have research studies looked at the risk of cancer in children whose mothers received SV40-contaminated polio vaccine?
- Does my child need additional doses of polio vaccine if he received a combination of OPV and IPV?
