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3 März 1955 Jahr - Polio Vaccine Developed

Beschreibung:

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 Jan 2019
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0
562

Datum:

3 März 1955 Jahr
Jetzt
~ 70 years ago

Abbildungen:

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