A viral disease of cows' udders which, when contracted by humans through contact, resembles mild smallpox, and was the basis of the first smallpox vaccines.
- The process induced cowpox, a mild viral disease that conferred immunity to smallpox.
- A spouse and child came down with a mild case of cowpox.
- At the end of the 1700s, Jenner realized that people who had contracted cowpox, or ‘vaccinia,’ didn't get smallpox.
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