Published in Disease Risk Factor Week, December 11th, 2005
"The New World was ravaged by smallpox for several centuries after the Spanish conquest. Jenner's discovery of the smallpox vaccine made possible the prevention and control of smallpox epidemics. In response to a large outbreak of smallpox in the Spanish colonies, King Charles IV appointed Francisco Xavier de Balmis to lead an expedition that would introduce Jenner's vaccine to these colonies," scientists writing in the journal Clinical Infectious Diseases report.
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