Salk's Vaccine Declared Safe: Polio's Terror Ends
Dr. Jonas Salk's polio vaccine earned its declaration of safety and effectiveness in 1955, instantly transforming a terrifying annual epidemic into a manageable medical challenge. This breakthrough directly enabled the rapid decline of paralytic polio cases across the United States within just a few years, sparing countless children from lifelong disability.
April 12, 1955
71 years ago
Key Figures & Places
What Else Happened on April 12
A Numidian legion turned its spears against Rome's own governors, slaughtering Gordian II in the streets of Carthage. His father, Gordian I, couldn't bear the n…
Shapur I ascended to the Sasanian throne as co-emperor alongside his father, Ardashir I, consolidating power within the young dynasty. This transition ensured a…
He stepped onto the throne at Ctesiphon not with a whisper, but with a roar that shook the Persian Gulf coast. Shapur I didn't just inherit a crown; he inherite…
The Eastern Emperor sent a warship loaded with gold to Rome, not peace. Anthemius accepted this bribe and climbed into a crumbling throne he could barely afford…
King Edwin of Northumbria accepted baptism from Bishop Paulinus on Easter Sunday, officially aligning his powerful Anglo-Saxon kingdom with the Roman Church. Th…
Duke Oldřich seized the Bohemian throne by ambushing and blinding his brother, Jaromír, forcing the deposed ruler into exile in Poland. This brutal consolidatio…
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