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22 févr. 1979 - No Polio in US

Description:

By 1979, there was no wild polio in the United States due to vaccines.

Ajouté au bande de temps:

History of Pathogens

14 déc. 2018

1

0

528

Date:

22 févr. 1979

Maintenaint

~ Il y a 46 ans

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