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JohnSnow

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“the physician John Snow (1813-1858) made a major contribution to fighting cholera when he was able to demonstrate a link between cholera and the contaminated drinking water through his pioneering studies”

source: https://​​www.rcseng.ac.uk/​​library-and-publications/​​library/​​blog/​​mapping-disease-john-snow-and-cholera/​​#:~:text=But%20it%20was%20not%20until,York%20on%2015%20March%201813.