- In the USA in 1960, two virologists discovered that both polio vaccines were contaminated with the SV 40 virus which causes cancer in animals as well as changes in human cell tissue cultures. Millions of children had been injected with these vaccines. (Med Jnl of Australia 17/3/1973 p555)
- In 1977, Dr Jonas Salk who developed the first polio vaccine, testified along with other scientists, that mass inoculation against polio was the cause of most polio cases throughout the USA since 1961. (Science 4/4/77 "Abstracts" )