vaccinia

Noun
  1. 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 (synset 114381427)
  2. A viral disease of cattle causing a mild skin disease affecting the udder;
    Formerly used to inoculate humans against smallpox (synset 114286384)

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