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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

ByReyna Avelar
16 Nov 2017

Date:

feb 14, 1874
Now
~ 150 years ago
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