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descubren la primera vacuna (jan 2, 1796 – jun 28, 1796)

Description:

la viruela era un gran problema por eso se vieron necesario encontrar una cura

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danna sofia campiño

25 Sep 2018

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823

Date:

jan 2, 1796

jun 28, 1796

~ 5 months and 28 days

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