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How U.S. schools proved Jonas Salk’s polio vaccine was safe

April 8, 2021 - By Harry McCracken

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In 1954, 1.3 million kids participated in a nationwide test that helped end one of the 20th century’s scariest threats.

When the U.S. Food and Drug Administration authorized the use of Pfizer and Moderna’s COVID-19 vaccines last December—a year after the coronavirus was first identified in Wuhan, China—it was a dramatic piece of good news after one of the most disruptive years the country has ever experienced.

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