The Disease That Died: Smallpox Eradicated
1980 · event
For three thousand years smallpox killed kings and children alike, 300 million in the 20th century alone. Then humanity worked together, village by village, needle by needle, until the World Health Assembly could declare: smallpox is dead. The only human disease we have ever driven extinct.
The strategy that won was not vaccinating everyone, it was "ring vaccination": find every outbreak, vaccinate everyone around it, and strangle the chains of transmission one by one, village by village, across every border and war zone on Earth.
The last natural case was a hospital cook in Somalia, Ali Maow Maalin, in 1977, he recovered and spent the rest of his life as a polio vaccinator. Smallpox remains the only human disease we have ever driven extinct: proof of what the species can do when it cooperates.