Whose idea led to the world’s first successful polio vaccine?

Jonas Salk developed the first successful polio vaccine, a major medical breakthrough announced in 1955. His vaccine used inactivated poliovirus and was tested in one of the largest medical trials in history, involving about 1.8 million children. The announcement led to widespread vaccination campaigns that sharply reduced polio cases worldwide. Later, Albert Sabin developed an oral polio vaccine, but Salk's was the first proven successful vaccine.