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feb 14, 1874 - 1874 los alemanes instituyeron la primer ley de vacunación donde se introduce la obligatoriedad de la vacunación contra la viruela a todos los niños en su primer año de vida,
Added to timeline:
vacyna
By
Reyna Avelar
16 Nov 2017
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Date:
feb 14, 1874
Now
~ 152 years ago
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