When the first practical polio vaccine was made in the 1950s, monkey kidney tissue was used. It was not realised that one of the viruses commonly found in monkey kidney cells can cause cancer in humans. The American government was warned of this but the doctor who gave the warning was ignored and her laboratory was closed down. How many people, who were vaccinated in the 1950s and 1960s, are now at risk at developing cancer because of that vaccine?
… You can find the answers to this simple quiz at the bottom of the page.