Edward Jenner full-blown infection. Later, he injected Phipps with variolous material, the routine method of immunization at that time. No disease followed. The boy was later challenged with variolous material and again showed no sign of infection. Donald Hopkins has written, "Jenner's unique contribution was not that he inoculated a few persons with cowpox, but that he then proved [by subsequent challenges] that they were immune to smallpox. Moreover, he demonstrated that the protective cowpox pus could be effectively inoculated from person to person, not just directly from cattle. Jenner successfully tested his hypothesis on 23 additional subjects. Jenner continued his research
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