Smallpox Eradicated
The World Health Organization declared smallpox eradicated — the first and only human disease to be deliberately wiped from the face of the Earth.
On May 8, 1980, the World Health Assembly officially declared that smallpox had been eradicated worldwide — the culmination of a global vaccination campaign led by the WHO that began in 1967. Smallpox, caused by the variola virus, had plagued humanity for at least 3,000 years, killing an estimated 300 million people in the 20th century alone. The eradication campaign, led by American epidemiologist D.A. Henderson, used a strategy of ring vaccination — identifying outbreaks and vaccinating everyone in the surrounding area. The last natural case occurred in Somalia in 1977. The eradication of smallpox remains humanity's single greatest public health achievement and a testament to what global cooperation can accomplish.
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A devastating pandemic — likely smallpox — swept through the Roman Empire, killing an estimated 5 million people and weakening Rome's military and economic foundations.
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The bubonic plague pandemic arrived in Europe, eventually killing an estimated 30-60% of the European population.
~1520Smallpox Devastates the Americas
European colonizers brought smallpox to the Americas, killing an estimated 90% of the Indigenous population and enabling the rapid conquest of vast civilizations.