Smallpox
Global commission certifies the eradication of smallpox
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Original prompt & settings (JSON) ↗Before declaring victory, collaborating laboratories tested more than 9,000 specimens from suspected cases in 1978 and 1979. Not one yielded the virus.
9 December 1979: nineteen signatures in Geneva
At WHO headquarters in Geneva on 9 December 1979, the 19-member Global Commission for the Certification of Smallpox Eradication concluded that smallpox eradication had been achieved worldwide — and its members signed a commemorative parchment recording the conclusion.
The verdict rested on process, not proclamation: country-by-country certification, review of eradication programs, surveillance data, and orthopoxvirus epidemiology and virology. The commission also concluded there was no evidence smallpox would return as an endemic disease.
Two years of looking for what wasn't there
Victory was not declared after the final naturally occurring case in 1977. Investigators spent two more years in active surveillance, hunting for a transmission chain they might have missed.
The clinching evidence was negative: during 1978–1979, collaborating laboratories tested more than 9,000 specimens from suspected cases, and none yielded variola virus.
Science first, politics five months later
The December 1979 signing was the scientific certification; the World Health Assembly formally accepted it in resolution WHA33.3 on 8 May 1980 — which is why sources shorthand either year as the 'official' declaration.
The distinction worth preserving: eradication meant the end of natural transmission of a human disease — the only such global eradication to date — not the extinction of the virus itself, since authorized laboratory stocks remained. The 1967–1980 intensified program cost about US$300 million, roughly two-thirds borne by the endemic countries themselves.
Sources
Researched 23 Aug 2026 5 sources 3 audit passes Date corrected
How this was checked
Researched from the web into a fact sheet, rewritten from that sheet, then audited against it by a different model. How the pipeline works →
Date corrected. The research places this at 1979-12-09.
What the sources leave uncertain
- WHO materials sometimes shorthand either 1979 or 1980 as the year smallpox was “officially declared” eradicated. The precise distinction is: Global Commission certification on 9 December 1979; World Health Assembly acceptance in resolution WHA33.3 on 8 May 1980.