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  • At the time, it was assumed that cholera was airborne. However, Snow did not accept this 'miasma' (bad air) theory, arguing that in fact entered the body through the mouth. He published his ideas in an essay 'On the Mode of Communication of Cholera' in 1849.
  • In August 1854, a cholera outbreak occurred in Soho. After careful investigation, including plotting cases of cholera on a map of the area, Snow was able to identify a water pump in Broad (now Broadwick) Street as the source of the disease. He had the handle of the pump removed, and cases of cholera immediately began to diminish.
  • John Snow is viewed by many as a pioneer in disease mapping. For the 1854 cholera outbreak in London's Broad Street region, he presented two maps. The first was shown on December 4, 1854 at a meeting of the London Epidemiological Society. Several months later he published this map in his book, On the Mode of Communication of Cholera, 2nd Edition. He used bars to represent deaths that occurred at the specified households. There were several minor errors in this map which were later corrected. One such error was in the place of the Broad Street pump. In his original map, the pump was located at the exact corner of Broad Street and Cambridge Street
  • BroadStreet
  • So Snow did something data journalists often do now: he mapped the cases. The map essentially represented each death as a bar, and you can see them in the smaller image above.It became apparent that the cases were clustered around the pump in Broad (now Broadwick) street.At a local brewery, the workers were allowed all the beer they could drink - it was believed they didn't drink water at all. But it had its own water supply too and there were consequently fewer cases In nearby Poland street, a workhouse was surrounded by cases but appeared unaffected: this was because, again, it had its own water supply. It turned out that the water for the pump was polluted by sewage from a nearby cesspit where a baby's nappy contaminated with cholera had been dumped. But he didn't just produce a map; it was one part of a detailed statistical analysis.
  • significantly increased our knowledge towards diagnosing and treating Cholera (the blue death). Which has helped many lives.
  • He sure did!!!
  • That John Snow dude really helped us with Cholera.
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