Dr. Jonas Salk
On April 12, 1955, Dr. Jonas Salk announced that the clinical trials of his polio vaccine found it was effective and safe, kicking off a national inoculation campaign.
Two years prior, there were 35,000 new cases of the debilitating disease in America. By 1961, Dr. Salk’s vaccine had reduced the number of new cases to just 161.
Photo ©1956 Yousuf Karsh
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