1955Reputable sourceWell documented
The polio vaccine
On the timeline · around 1955 ·
What happened
Jonas Salk's inactivated polio vaccine was declared safe and effective after a massive field trial, as epidemics peaked worldwide.
Why it matters
It began the near-eradication of a disease that had paralyzed hundreds of thousands of children.
Sources
- US Centers for Disease Control and Prevention. Polio and its history · Reputable source