[History: Medical Breakthrough] The Day Polio Met Its Match: The Salk Vaccine of 1955
On April 12, 1955 — the tenth anniversary of Franklin Roosevelt's death from polio complications — Dr. Jonas Salk's vaccine against poliomyelitis was declared "safe, effective, and potent" in Ann Arbor, Michigan. Within two years, America's most feared childhood disease was in full retreat. Within four decades, it was nearly gone from the earth.