"In 1954, national testing began on 1 million children, ages 6-9, who became known as the Polio Pioneers. On 4.12.55, the results were announced: the vaccine was safe & effective. In the 2 yrs before the vaccine was widely available, the average # of polio cases in the U.S. was more than 45,000. By 1962, that # had dropped to 910. . . . #Salk never patented the vaccine or earned any $ from his discovery, preferring it be distributed as widely as possible."
https://www.salk.edu/about/history-of-salk/jonas-salk/
#RFK
#USPol