The expedition systematically infected orphaned boys with cowpox throughout the duration of the voyage so that the live vaccine survived all the way to the Americas.
Jenner scientifically tested, and proved, that infection with the mild disease of cowpox gave immunity to the more dangerous smallpox disease.
On the 11th September 1978, Janet Parker became the last recorded person in the world to die from smallpox.
28th June 2015
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