Dr. John Snow

Dr. John Snow was a pioneering British physician in the 19th century known for his work in understanding how diseases spread. During a cholera outbreak in London, he carefully mapped cases and identified a common source—the public water pump on Broad Street. His investigation demonstrated that cholera was transmitted through contaminated water, not bad air, which was the common belief at the time. Snow’s approach laid the foundation for modern epidemiology and demonstrated the importance of data analysis and scientific methods in controlling infectious diseases.