definition
An acute, highly contagious, often fatal infectious disease caused by an orthopoxvirus characterized by a biphasic febrile course and distinctive progressive skin eruptions. Vaccination has succeeded in eradicating smallpox worldwide. (Dorland, 28th ed)
UMLS
Classical smallpox, Smallpox, Smallpox NOS, Smallpox, NOS, Smallpox, unspecified, Variola, Variola major, Variola, major, Variola, NOS, Variolas