Cowpox children. In 1796, British medical practitioner Edward Jenner tested the theory that cowpox could protect someone from being infected by smallpox. Although cowpox originates on the udder of cows, Jenner took his sample from a milkmaid, Sarah Nelmes. Jenner extracted the pus of one of the lesions formed by cowpox on Nelmes to another individual who never had smallpox, James Phipps. He eventually developed a scab and fever that was manageable. Approximately six weeks later, Jenner then introduced an active sample of the smallpox virus into Phipps to test the theory. After being observed for an extended amount of time,
Caitlyn Jenner new personal best time and won the gold medal with a world-record score of 8,618 points. Olympic world record performance: After the event, Jenner took an American flag from a spectator and carried it during the victory lap, starting a tradition that is now common among winning athletes. Abandoning vaulting poles in the stadium, with no intention of ever competing again, Jenner stated that: "In 1972, I made the decision that I would go four years and totally dedicate myself to what I was doing, and then I would move on after it was over with. I went into that