| progressive vaccinia | (n) a severe or even fatal form of vaccinia that occurs mainly in persons with an immunological deficiency; characterized by progressive enlargement of the initial lesion, Syn. vaccinia gangrenosa |
| vaccinia | (n) 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, Syn. variola vaccine, vaccina, variola vaccinia, variola vaccina |
| cowpox | (n) a viral disease of cattle causing a mild skin disease affecting the udder; formerly used to inoculate humans against smallpox, Syn. vaccinia |
