Origin year places a health practice in the year it was first adopted. Wikipedia records that after Semmelweis introduced hand washing in 1847, "the maternal mortality rate dropped from 18% to less than 2%" on his ward almost immediately. Browsing by origin year shows how long a practice a visitor takes for granted has actually been in use.
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Era of EmergenceSourced to the subject's own account 1790s
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Sources
1. Wikipedia: Vaccination
WikipediaVaccination, History sectionQuote, Vaccination, History section
In 1796, Edward Jenner, a doctor in Berkeley in Gloucestershire, England, tested a common theory that a person who had contracted cowpox would be immune from smallpox.
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