In this paper he theorised that cholera was not transmitted by bad air but through tainted water supplies. Dr Snow's map showing the cases of cholera in Broad Street, London, 1854. The map helped ...

And those were the conditions when Dr. Snow went to work. Snow determined which apartment buildings in Golden Square had people who were either sick or had died of cholera. He drew a map using ...

John Snow is often called the founder of epidemiology, the study of health in populations. He is best known for his work on tracking the spread of cholera ... the cases on a map.