[Answer] What is the only human disease to have been completely eradicated by vaccination?

Step 1 : Introduction to the question "What is the only human disease to have been completely eradicated by vaccination?"

...Smallpox is the only human disease that has been fully eradicated by vaccination. Caused by the variola virus, smallpox plagued humanity for thousands of years with deadly outbreaks. In 1796, Edward Jenner’s pioneering work on the smallpox vaccine laid the foundation for modern immunology. The World Health Organization launched an global eradication program in 1967, and after years of coordinated vaccination campaigns, the last naturally occurring case was reported in Somalia in 1977. The WHO officially declared smallpox eradicated in 1980.

Step 2 : Answer to the question "What is the only human disease to have been completely eradicated by vaccination?"

Smallpox:

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