Polio peaked at nearly 58,000 U.S. cases in 1952, and America remembers beating it, but the money came from the March of Dimes and the science from university labs. A privately run 1954 field trial led to the Salk vaccine being declared safe in April 1955, and the Public Health Service licensed it that day. When defective Cutter doses paralyzed about 200 children weeks later, the PHS investigated and rebuilt vaccine-safety regulation.
Who deserves credit for the polio victory is a question of framing, since funding was private and science academic. The Cutter incident is read both as a regulatory failure and as the birth of modern vaccine-safety oversight, and the Salk and Sabin camps were rivals.



