Before it was eradicated worldwide, smallpox was the #1 killer of human beings over time.

How we conquered the deadly smallpox virus – Simona Zompi
The Last Major Smallpox Outbreak in America
Learning from smallpox: How to eradicate a disease – Julie Garon and Walter A. Orenstein
History of Vaccines – Killing Smallpox – Extra History
Vaccines 101: Origin of Vaccines
From Smallpox To The Coronavirus: The History Of Vaccinations Explained | NBC News
Understanding The Outbreak: How smallpox infects the body
10 Deadliest Diseases in Human History
Virology Lectures 2019 #1: What is a virus?

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