The smallpox vaccine is used to prevent smallpox infection caused by the variola virus.[10] It is the first vaccine to have been developed against a contagious disease. In 1796, British physician Edward Jenner demonstrated that an infection with the relatively mild cowpox virus conferred immunity against the deadly smallpox virus. Cowpox served as a natural vaccine until the modern smallpox vaccine emerged in the 20th century. From 1958 to 1977, the World Health Organization (WHO) conducted a global vaccination campaign that eradicated smallpox,[10] making it the only human disease to be eradicated. Although routine smallpox vaccination is no longer performed on the general public, the vaccine is still being produced for research,[10] and to guard against bioterrorism, biological warfare, and mpox.[11][12]
The term vaccine derives from the Latin word for cow, reflecting the origins of smallpox vaccination. Edward Jenner referred to cowpox as variolae vaccinae (smallpox of the cow). The origins of the smallpox vaccine became murky over time,[13] especially after Louis Pasteur developed laboratory techniques for creating vaccines in the 19th century. Allan Watt Downie demonstrated in 1939 that the modern smallpox vaccine was serologically distinct from cowpox,[14] and vaccinia was subsequently recognized as a separate viral species. Whole-genome sequencing has revealed that vaccinia is most closely related to horsepox, and the cowpox strains found in Great Britain are the least closely related to vaccinia.[15]
^ abCite error: The named reference Imvanex EPAR was invoked but never defined (see the help page).
^Anderson MG, Frenkel LD, Homann S, and Guffey J. (2003), "A case of severe monkeypox virus disease in an American child: emerging infections and changing professional values"; Pediatr Infect Dis J;22(12): 1093–96; discussion 1096–98.
^Baxby D (1981). Jenner's Smallpox Vaccine: The Riddle of Vaccinia Virus and Its Origin. Heinemann Educational Books. ISBN978-0-435-54057-9.
^Cite error: The named reference downie1939 was invoked but never defined (see the help page).