14 mayo 1796 año - 4 May 1796: Edward Jenner tests his hypothesis: People that have had cowpox would be immune to smallpox. He observed this because he saw that many milk maids were immune to smallpox. He proved his hypothesis by inoculating (vaccinating) an eight year old boy. Later, he was exposed to variolous material, but no infection followed. He contributed because he subsequently showed how this worked and finally vaccination was accepted and variolation was later banned.
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14 mayo 1796 año
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~ 228 years ago
