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3 март 1955 г. - Polio Vaccine Developed

Описание:

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 янв 2019
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0
562

Дата:

3 март 1955 г.
Сейчас
~ 70 г назад

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