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After years of research, his discovery was confirmed in early 1955 and announced to the press and public in April 1955.

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13y ago
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10y ago

Jonas Salk did not discover polio. He invented a vaccine for polio in 1955.

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13y ago

yesterday

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13y ago

In 1952

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10y ago

1952

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Q: When did Jonas Salk discover the polio vaccine?
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