| progressive vaccinia | |
noun | |
| 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 |
progressive vaccinia n.
A severe or even fatal form of vaccinia occurring as a complication of smallpox vaccination chiefly in persons with an immunologic deficiency or dyscrasia, characterized by progressive enlargement of the initial and secondary lesions.