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Brit. physician, 1749–1823. Jenner observed that individuals exposed to cowpox, such as milkmaids, would develop a minor skin lesion and then be immune to smallpox. From this observation he developed a vaccine from cowpox lesions, which provides immunity to smallpox.
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Jenner, Edward(1741–1823) English physician who discovered that cowpox lymph matter could be safely used as an inoculum (a VACCINE) to prevent smallpox. The first vaccination was carried out in 1796.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005