anniversary

Anniversary of Polio Vaccine: Photos of 1950s Outbreak

Updated 2025-04-12T15:36:01Z This story is available exclusively to Business Insider subscribers. Become an Insider and start reading now. Have an account? Log in. On April 12, 1955, researchers announced the first polio vaccine, which was instantly approved. Before vaccines were available, polio caused 15,000 cases of paralysis in the US…