The Smallpox Vaccine Uses the ______ Virus

Question

The smallpox vaccine uses the ______ virus.
A) herpes simplex
B) vaccinia
C) smallpox
D) human herpesvirus 6
E) variola

Accepted Answer

The smallpox vaccine uses the vaccinia virus, which is a poxvirus related to but different from the smallpox (variola) virus. Vaccinia is used because it can confer immunity against smallpox without causing the disease itself.