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22 fev 1979 ano - No Polio in US

Descrição:

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

Adicionado na linha do tempo:

History of Pathogens

14 dez 2018

1

0

528

Data:

22 fev 1979 ano

Agora

~ 46 years ago

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