2 mar 1796 año - Vaccine
Descripción:
Edward Jenner discovers that purposefully giving people cowpox, a harmless disease but similar to smallpox, makes them immune to smallpox. He called this new method "vaccination."(from http://broughttolife.sciencemuseum.org.uk/broughttolife/people/edwardjenner)
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fecha:
2 mar 1796 año
Ahora mismo
~ 229 years ago