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3 mar 1955 año - Polio Vaccine Developed

Descripción:

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 ene 2019
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fecha:

3 mar 1955 año
Ahora mismo
~ 70 years ago

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