Thanks for the interesting link.
...All health authorities agree that both the Salk Inactivated Polio Vaccine (IPV) and Sabin Oral or “live” Polio Vaccine (OPV) were contaminated with SV40 up until 1961. The contamination has been estimated to have exposed up to 30 million Americans and millions more in the USSR (where the OPV clinical trials were conducted) and other countries...
...In the U.S., federal law did not require that SV40 contaminated vaccines be discarded if they were manufactured before the new regulations went into effect. This meant that vaccines contaminated with SV40 were administered to children and adults until they were used up...