Look up Smallpox in Wikipedia and you’ll find this:
Smallpox was an infectious disease …
The definition is in the past tense! Mankind eradicated this disease from the planet.
The global eradication of smallpox was certified, based on intense verification activities in countries, by a commission of eminent scientists on 9 December 1979 and subsequently endorsed by the World Health Assembly on 8 May 1980.[5][77] The first two sentences of the resolution read:
Having considered the development and results of the global program on smallpox eradication initiated by WHO in 1958 and intensified since 1967 … Declares solemnly that the world and its peoples have won freedom from smallpox, which was a most devastating disease sweeping in epidemic form through many countries since earliest time, leaving death, blindness and disfigurement in its wake and which only a decade ago was rampant in Africa, Asia and South America.
Roy Mackay 