Who developed the smallpox vaccine in 1796?

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Vaccination uses a milder, related organism or its product to train the immune system to recognize and fight a more dangerous disease. Edward Jenner observed that milkmaids who had contracted cowpox seemed immune to smallpox, a much more dangerous disease. He tested this idea by inoculating a young boy with material from cowpox and later exposing him to smallpox; the boy did not develop smallpox, demonstrating that immunity could be induced by a milder infection. Jenner’s work gave birth to the practice of vaccination and the term itself (from vacca, cow), laying the foundation for modern immunization and, ultimately, the eradication campaigns against smallpox. The other figures contributed to different vaccines or discoveries: Salk developed a polio vaccine in the 1950s; Pasteur worked on vaccines for diseases like rabies and cholera; Fleming discovered penicillin. So, the developer of the smallpox vaccine in 1796 is Edward Jenner.