sourced story
May 8, 1980Reputable source · 2 sourcesWell documented

The World Declares Smallpox Eradicated

A thirteen-year global vaccination campaign ends the only human disease ever deliberately wiped off the planet

On the timeline · around May 8, 1980 · Emerging ThreatsModern Pandemics and Modern MedicineEmerging ThreatsThe World Declares Smallpox Eradicated19501960197019801990

Quick facts

Strategy
Ring vaccination, developed by William Foege
Campaign cost
About $300 million, 1967-1980
Last natural case
Ali Maow Maalin, Merca, Somalia, diagnosed October 26, 1977
Declaration date
May 8, 1980, by the 33rd World Health Assembly
20th-century toll before eradication
An estimated 300 million deaths

What happened

The World Health Organization launched an Intensified Eradication Program for smallpox in 1967, deploying a strategy called ring vaccination, developed by epidemiologist William Foege, that focused vaccination on people surrounding each new case rather than trying to vaccinate entire populations. The thirteen-year campaign cost about $300 million and involved roughly half a billion individual vaccinations delivered by thousands of health workers worldwide. The last known case of naturally occurring smallpox was Ali Maow Maalin, a hospital cook in Merca, Somalia, diagnosed with the milder Variola minor strain on October 26, 1977; none of his many contacts developed the disease, and aggressive containment stopped any further spread. On May 8, 1980, the 33rd World Health Assembly formally declared: "The world and all its peoples have won freedom from smallpox."

Why it matters

Smallpox is the only human disease ever eradicated worldwide through deliberate intervention, after killing an estimated 300 million people in the 20th century alone and plaguing humanity for roughly 3,000 years. The campaign's success validated ring vaccination as a strategy still used against other outbreaks today, and it proved that a virus with no animal reservoir, unlike Yersinia pestis or influenza, can in principle be eliminated entirely if vaccination coverage and case tracing are thorough enough.

How we know

The World Health Organization's own archives document the campaign's cost, vaccination totals, and the formal 1980 declaration text; the U.S. National Library of Medicine's historical exhibition corroborates the timeline of Maalin's case and the lead-up to the eradication announcement.

Sources

See something wrong? . Corrections with a source get fixed fastest.

Part of a timelinePandemics Through History24 events · How plague, pox, and pandemic flu remade societies, and how the science of germs and vaccines fought backView all →
The World Declares Smallpox Eradicated · Pandemics Through History · SourcedStory