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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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1 ene 1796 año - Edward Jenner tests his hypothesis
Descripción:
by inoculating an 8 year old boy with cowpox = variolation.
Añadido al timeline:
B HLTH 224
By
Kelly Stevens
13 dic 2018
1
0
908
fecha:
1 ene 1796 año
Ahora mismo
~ 229 years ago
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