Another Polio Question?!
Question: what mistakes were made after the first polio vaccine came out?
Answers: what mistakes were made after the first polio vaccine came out?
The Salk vaccine released between 1955 and 1963 was contaminated with Simian Virus 40 (Rhesus monkeys). SV-40 is proven to cause cancer in research animals. The vaccines produced weren't adequately tested before release for general use. The FDA didn't act on this.