Who developed the first successful polio vaccine in the 1950s?

The answer is Jonas Salk, who successfully developed the first polio vaccine in the 1950s. His vaccine, known as the inactivated polio vaccine (IPV), was composed of killed poliovirus strains, which enabled the immune system to develop defenses against the disease without actually causing it. Salk's groundbreaking achievement had a significant impact worldwide, greatly reducing the number of polio cases and contributing to the eventual eradication efforts.