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14 fev 1874 ano - 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,

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vacyna

ByReyna Avelar
16 nov 2017
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14 fev 1874 ano
Agora
~ 151 years ago
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