7 nov 1796 año - Vaccination for smallpox was found
Descripción:
Edward Jenner found the vaccination for smallpox when he discovered that people who ad contracted the cowpox disease never smallpox. He then took pus from a lady who cowpox injected into a child. It made him sick but he recovered.
The child was injected with smallpox disease and he never got sick. That is how the vaccination against smallpox was discovered.
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