The only human disease we have ever truly defeated
In short: For centuries, smallpox was a global terror, killing up to 30 percent of its victims and leaving survivors with permanent disfigurement. Yet, through a monumental feat of global coordination, it became the first—and so far only—human infectious disease to be officially eradicated from the face of the Earth.
The origins of the variola virus remain a subject of intense scientific detective work. While some scholars once theorized the disease emerged in ancient Mesopotamia or the Nile Valley, recent genetic analyses of a mummified child in Lithuania suggest the virus had evolved by at most the 17th century. However, even older evidence exists: DNA recovered from human remains in modern-day Denmark and Russia, dating to between 600 and 1050, indicates the virus was circulating much earlier. Some researchers even suggest it may have been a factor in the Plague of Athens in 430 BCE.
Before the advent of modern immunology, humanity relied on much riskier methods of protection. In parts of Asia and Africa, 'variolation' was practiced—transferring material from smallpox sores directly into healthy individuals. In China, this involved 'insufflation,' where dried scabs were ground into powder and blown into the nostrils. While these methods carried a roughly 2 percent mortality rate—significantly lower than the 20 to 30 percent death rate of natural infection—they were still dangerous and often limited to the wealthy.
The turning point arrived in 1796 with the English physician Edward Jenner. Noting that cowpox offered immunity, Jenner used material from a cowpox lesion to vaccinate 8-year-old James Phipps. When Phipps was later exposed to smallpox, he remained healthy, proving the superiority of vaccination. This breakthrough paved the way for the World Health Organization's 1967 global campaign. By May 1980, the intense effort of mass vaccination and surveillance successfully led to the official declaration of global eradication.
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Sources
- Summary by Intellect · source: Smallpox | Definition, History, Vaccine, & Facts | Britannica
- Also: History of smallpox vaccination
- Also: History of smallpox
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