a local infection induced in humans by inoculation with the virus causing cowpox in order to confer resistance to smallpox; normally lasts three weeks and leaves a pitted scar
a viral disease of cattle causing a mild skin disease affecting the udder; formerly used to inoculate humans against smallpox
vaccinia的用法和樣例：
例句
用作名詞 (n.)
Since vaccinia may cure smallpox, then monkey? 牛痘既然可以治癒天花，那麽猴子呢？
However, a virus called vaccinia spreads four times faster than what was thought possible. 然而，一種名為牛痘的病毒傳播的速度比我們所能想像的快四倍。
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