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Immunization against Smallpox before Jenner

Long before he introduced inoculation with cowpox, smallpox was prevented by inoculation with smallpox itself. The procedure was risky, but its spread in the 18th century set the stage for Jenner

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Scientific American Magazine Vol 234 Issue 1This article was originally published with the title “Immunization against Smallpox before Jenner” in Scientific American Magazine Vol. 234 No. 1 (), p. 112
doi:10.1038/scientificamerican0176-112