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27 jan 1991 ano - En 1991 La poliomielitis se eliminó oficialmente de los Estados Unidos y del resto del hemisferio occidental gracias a la vacuna.
Adicionado na linha do tempo:
vacyna
By
Reyna Avelar
16 nov 2017
0
0
287
Data:
27 jan 1991 ano
Agora
~ 33 years ago
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