England: Edward Jenner administers the first ever vaccination to prevent disease.
It was for Small pox, a disease that had killed millions.
discovery of the vaccine occurred when Jenner observed that milk girls who had
suffered the much less serious Cow Pox, didn't get Small Pox.
his 8 year old (!) patient, James Phipps, Jenner scratched his skin with
the fluid from a Cow Pox blister. The boy soon recovered from this. Phipps was
then inoculated with Small Pox and he suffered no ill symptoms.
discovery was quickly used by other doctors around the world.