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3 mars 1955 - Polio Vaccine Developed

Description:

Dr. Jonas Salk developed an inactivated polio vaccine (IPV) and it became available in the United States. The United States was subsequently declared polio-free in 1979.

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ByMackenzie Collins
16 janv. 2019
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Date:

3 mars 1955
Maintenaint
~ Il y a 70 ans

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