Over thousands of years, smallpox killed hundreds of millions of people. The disease was highly infectious, with no known cure.
Less than 200 years after the discovery of the #smallpox vaccine by Dr Jenner, the lethal disease was eradicated all over the world. #VaccinesWork pic.twitter.com/f6ckZzHzUl— World Health Organization (WHO) (@WHO) January 26, 2023
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