Immunizing substance against disease. The term derives from the Latin vacca, cow. Louis Pasteur proposed in the late 19th century for all immune inoculations in honor of the English physician Edward Jenner, "who has saved more lives than any other man", who in the late 18th century investigated the bovine smallpox (variolae vaccinae) that were contracted by milkers, which immunized them against human smallpox. With the pus of the blisters of the hand of a cow milker infected an 8-year-old boy and many other people. Everyone was vaccinated against smallpox that was once raving.
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