Onesimus
late 1600s-1700s · Contribution: c.1716-1721
Introduced the principle and procedure of variolation (smallpox inoculation) to colonial Boston — deliberately introducing material from a smallpox pustule into a small skin wound to confer immunity — based on a practice long used in West Africa
Portraits are AI-generated interpretations, not photographs.
Impact on the world
His knowledge drove the first organized inoculation campaign in colonial America during the 1721 Boston epidemic, cutting the death rate among the inoculated roughly six-fold and helping lay the groundwork for later vaccination.
Life & background
An African (likely Akan) man enslaved by Puritan minister Cotton Mather in Boston from 1706. He had been inoculated in Africa and described the technique to Mather, who (with physician Zabdiel Boylston) promoted it in 1721. Onesimus partially purchased his freedom; little is known of his later life. Named one of Boston's 'Best Bostonians of All Time' (2016).
Sources
- History.com; Smithsonian; History of Vaccines (College of Physicians of Philadelphia)
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