1854 Broad Street cholera outbreak

You are standing in the heart of Soho, a location that marks the foundation of modern epidemiology. In eighteen fifty-four, this street was the epicenter of a terrifying cholera outbreak that claimed more than six hundred lives in just ten days. At the time, the medical community held firmly to the miasma theory, which blamed outbreaks on foul-smelling air rising from sewage and waste. Local physician John Snow suspected a different culprit, convinced that the disease was actually traveling through the water supply. He meticulously plotted the deaths on a map and discovered a chilling pattern, with cases clustering tightly around a single public water pump on Broad Street. By presenting this geographic evidence to local authorities, Snow convinced them to remove the handle from the pump, effectively disabling the well. This simple, decisive action caused the local epidemic to plummet, proving that cholera was a waterborne disease and transforming how the world understands the transmission of infection.