John Snow (cholera outbreak studies)

John Snow was a pioneering epidemiologist who studied a cholera outbreak in London in 1854. He mapped affected cases and identified a common source: a contaminated water pump on Broad Street. By removing the pump handle, he effectively stopped the outbreak. His work demonstrated that cholera spread through contaminated water, revolutionizing disease prevention and public health. Snow's methods laid the foundation for modern epidemiology by showing how to identify and control disease sources through careful investigation and data analysis.