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Original map by John Snow showing the clusters of cholera cases (indicated by stacked rectangles) in the London epidemic of 1854. The contaminated pump is located at the crossroads of Broad Street and Cambridge Street (now Lexington Street), running into Little Windmill Street.
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John Snow (15 March 1813 – 16 June 1858 [1]) was an English physician and a leader in the development of anaesthesia and medical hygiene.He is considered one of the founders of modern epidemiology and early germ theory, in part because of his work in tracing the source of a cholera outbreak in London's Soho, which he identified as a particular public water pump.
The Ghost Map: The Story of London's Most Terrifying Epidemic – and How it Changed Science, Cities and the Modern World is a book by Steven Berlin Johnson in which he describes the most intense outbreak of cholera in Victorian London and centers on John Snow and Henry Whitehead. [1] It was released on 19 October 2006 through Riverhead.
31 August – 8 September – an epidemic of cholera in London kills 10,000. Dr John Snow traces the source of one outbreak (that killed 500) to a single water pump, validating his theory that cholera is water-borne, and forming the starting point for epidemiology. [11] 18 September – St George's Hall, Liverpool, opens. [12]
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John Snow's cholera map about the cholera deaths in London in the 1840s, published 1854. Another example of early thematic mapping comes from London physician John Snow. Though disease had been mapped thematically, Snow's cholera map in 1854 is the best-known example of using thematic maps for analysis.