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The 1850s map that changed how we fight outbreaks

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 Society / Culture   |   Health   |   Social Science
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It all starts with a pump.

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In this episode of Vox Almanac, Voxs Phil Edwards explores Dr. John Snows map of the Broad Street Pump, which changed epidemiology forever.

In 1854, news spread about a mysterious new cholera outbreak in London. At the time, doctors and scientists largely believed the disease traveled in a miasma a floating cloud of sickness. Dr. John Snow suspected bad water might actually be the agent of transmission and he wanted to prove it in time to stop the outbreak.

Through a mix of personal interviews, clever detective work, and data analysis that included tables and a famous map, Snow managed to stop the outbreak and convince local public health officials, eventually, that cholera could be transmitted through water, not a miasma. Since his breakthrough study, the map has become an iconic piece of epidemiological history, as an illustration of keen detective work, analysis, and visual representation with a map that, even today, tells a story.

Watch the above video to learn more.

Further Reading:

Cholera, chloroform, and the science of medicine : a life of John Snow

This lengthy academic study of John Snows life and work follows his career as a pioneering anesthesiologist as well as his work on cholera. It clears up a lot of misconceptions about his influence and work and gives you a bit of a picture of snow as a person (he was a teetotaler and vegetarian both unusual for the time).

Cartographies of disease : maps, mapping, and medicine

Tom Kochs history of disease mapping is a great overview of the discipline. It shows how the practice existed before Snow, how Snows map changed and influenced the field (and how it didnt), and how far disease mapping has come since. is a news website that helps you cut through the noise and understand what's really driving the events in the headlines. Check out

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