"Jonas Salk innoculating a boy, as two nurses assist him." 1954, Library of Congress.
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Jonas Salk was the first doctor to discover a polio vaccine. At this time, polio was affecting more than 58,000 people in the U.S. each year, mostly children. When Salk was researching the disease, he used a vast amount of resources, taking seven years before the vaccine was ready to be distributed, beginning in 1955. Through Salk's determination, polio is nearly eradicated in the U.S. today.
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