Infecting people with _______ led to vaccination against smallpox.

Name: Infecting people with _______ led to vaccination against smallpox.
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Infecting people with cowpox led to vaccination against smallpox. Edward Jenner observed that milkmaids, who had contracted a mild disease called cowpox, did not get infected with smallpox. He then introduced cowpox material into the skin of a healthy person and proved that it provided immunity against smallpox. This led to the development of the smallpox vaccine.

Infecting People with _______ Led to Vaccination Against Smallpox