Thesing, William B., editor. Dictionary of Literary Biography 240. Gale Research.
240: 105
Matthew, Henry Colin Gray et al., editors. Oxford Dictionary of National Biography. http://www.oxforddnb.com/.
Timeline
By 1802: The smallpox vaccination method established...
National or international item
By 1802
The smallpox vaccination method established by Edward Jenner
was coming into use around the world; in England about 100,000 people had been vaccinated, and the annual smallpox death rate (which had averaged about 3,000 per...
