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Edward Jenner wanted to trial his hypothesis based on countryside folklore, that milkmaids never contracted smallpox.
In 1796, Jenner experiments on 8 year old James Phipps. He takes pus from a cowpox pustule, makes a cut in James's arm and inserts the liquid.
James contracts cowpox, and then recovers, only suffering a light fever for a few days.
A few weeks after recovery, Jenner gives James smallpox using the same previous method.
James remains healthy and does not contract smallpox.
Jenner names this procedure "vaccine", coming from the latin word for cow, "vacca".
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