Smallpox |
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| Minor, Variola; Minors, Variola; Variola Minors; Variolas | |
| 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) | |