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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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14 feb 1796 año - 1796 Edward Jenner inventó la primera vacuna contra la viruela
Añadido al timeline:
vacyna
By
Reyna Avelar
16 nov 2017
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375
fecha:
14 feb 1796 año
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~ 229 years ago
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