Edward Jenner — "The deviation of man from the state in which he was originally placed by nature …"
The deviation of man from the state in which he was originally placed by nature seems to have proved to him a prolific source of diseases.
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More from Edward Jenner
"My greatest ambition has always been to be useful to mankind."
"The greatest reward for my labours is the satisfaction of having done good to my fellow creatures."
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"It is a fortunate circumstance, that the Cow Pox is not infectious; for if it were, it would be a source of great alarm."
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Understanding this quote
What it means
When humans depart from a simpler natural state — through domesticating livestock, crowding into towns, or reshaping their environment — they create conditions that breed new diseases. Civilization itself, with its farming practices and dense settlements, generates illness that wouldn't otherwise exist. This is an early recognition of what modern epidemiology understands as the link between human ecological disruption and infectious disease emergence.
Relevance to Edward Jenner
Jenner discovered vaccination by observing dairy milkmaids who contracted cowpox through animal contact — the very deviation from nature he describes. His core insight was that human proximity to cattle created both disease pathways and unexpected immunity. As a country physician in rural Gloucestershire, he spent decades watching how agricultural life shaped health. His entire vaccine theory rested on understanding how human-animal ecological relationships drove infectious disease.
The era
In the late 1700s, Europe was undergoing rapid agricultural intensification and early urbanization. Smallpox killed roughly 400,000 Europeans annually. Enlightenment philosophy, particularly Rousseau's noble savage ideal, framed civilization as corrupting natural human health. Jenner wrote this in his landmark 1798 paper, the same year he introduced vaccination. Growing human-livestock contact through enclosure farming made cross-species disease transmission newly visible to observant physicians.
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