Smallpox Eradication (1796-1980)
Edward Jenner demonstrated in 1796 that cowpox inoculation protected against smallpox. Nearly two centuries later, the WHO launched an intensified eradication campaign in 1967. Through mass vaccination and surveillance-containment, the disease was eliminated worldwide. The last natural case occurred in Somalia in 1977.
WHO declared smallpox eradicated in 1980—the first and still only human disease eliminated through vaccination.
Smallpox eradication proved that a coordinated global vaccination campaign could eliminate a disease entirely, establishing the template for subsequent efforts against polio and other vaccine-preventable diseases.
HIV's extreme mutation rate and ability to establish lifelong latent infections make eradication far more difficult than smallpox. But smallpox demonstrates that vaccines can end pandemics—the question for HIV is whether scientists can design one that works against a vastly more challenging pathogen.