Our Smallpox Main Article provides a comprehensive look at the who, what, when and how of Smallpox
Medical Definition of Vaccinia
Vaccinia: 1. The cowpox virus which is used to vaccinate against smallpox. 2. A cutaneous or systemic reaction to vaccination with the smallpox vaccine as, for example, in congenital vaccinia and progressive vaccinia.
Last Editorial Review: 9/14/2016
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