John Snow (physician)

John Snow (1813-1858) was an English physician and anesthesiologist who is considered one of the founders of modern epidemiology. He is best known for his work on the cholera outbreak in London in 1854, where he used data and mapping to identify the source of the outbreak as a contaminated water pump on Broad Street. This work is considered a cornerstone in the field of epidemiology, and helped establish the basic principles of disease control and prevention. Snow's work also led to the acceptance of the germ theory of disease, which holds that microorganisms are responsible for many infections.

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