Cowpox children. In 1796, British medical practitioner Edward Jenner tested the theory that cowpox could protect someone from being infected by smallpox. Although cowpox originates on the udder of cows, Jenner took his sample from a milkmaid, Sarah Nelmes. Jenner extracted the pus of one of the lesions formed by cowpox on Nelmes to another individual who never had smallpox, James Phipps. He eventually developed a scab and fever that was manageable. Approximately six weeks later, Jenner then introduced an active sample of the smallpox virus into Phipps to test the theory. After being observed for an extended amount of time,
Thomas Jenner (publisher) Jenner published a series of tracts entitled "A further Narrative of the Passages of these Times", containing an engraving of the populace pulling down Cheapside Cross, together with portraits of Oliver Cromwell, Francis Manners, 6th Earl of Rutland, and Sir William Wadd, Constable of the Tower, signed "Thomas Jenner fecit". In 1650 he issued "A Work for none but Angels and Men, that is to be able to look into and know ourselves. Or a Booke showing what the Soule is". According to Thomas Corser it is a prose translation of Sir John Davies's poem on the immortality of the