Smallpox
World Health Assembly declares global smallpox eradication
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Original prompt & settings (JSON) ↗The declaration came at 4:10 p.m. in Geneva — more than two years after the last endemic patient, because the world first had to spend those years actively hunting for another case and finding none.
8 May 1980, 16:10, Geneva
At its eighth plenary meeting, the Thirty-third World Health Assembly adopted resolution WHA33.3, declaring that global smallpox eradication had been achieved. The moment is logged in the proceedings to the minute: 16:10, 8 May 1980.
The Assembly was endorsing, not discovering. The scientific certification had come in December 1979 from the Global Commission for the Certification of Smallpox Eradication, a panel drawn from 19 nations; the resolution converted that finding into the formal position of WHO's member states.
Why the two-year gap
The last endemic case was Ali Maow Maalin, a hospital cook and health worker in Merca, Somalia, in October 1977 — he recovered. Certification then required two years of intensified surveillance that turned up no continuing natural transmission.
One event complicated but did not invalidate that record: the 1978 laboratory-associated outbreak in Birmingham, England, which shaped laboratory-containment policy rather than the certification of natural transmission's end.
What the world retired that day
A companion resolution, WHA33.4, adopted the post-eradication regime: routine vaccination ended except for specially exposed investigators, and international smallpox-vaccination certificates for travelers were retired.
The disease being closed out had, by WHO's estimate, killed some 300 million people in the twentieth century alone. Eradication did not mean the virus vanished entirely: authorized live variola stocks remain under WHO oversight at designated repositories in the United States and Russia.
Sources
Researched 23 Aug 2026 7 sources 3 audit passes
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 →
What the sources leave uncertain
- Sources often say WHO 'certified' eradication in 1980. More precisely, the Global Commission certified it in December 1979; the World Health Assembly formally endorsed that finding and declared eradication on May 8, 1980.
Checked against
- WHA33.3 — Declaration of Global Eradication of Smallpox
- Thirty-third World Health Assembly proceedings
- Thirty-third World Health Assembly resolutions and decisions
- WHO commemorates smallpox eradication
- WHO smallpox fact page
- Poxvirus Viability and Signatures in Historical Relics
- The world's last endemic case of smallpox