Dr John Snow, a physician and specialist in ... 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 to identify ...

For 14 weeks in the late summer of 1853, London suffered one of its worst cholera outbreaks. The leading voices in medicine believed the disease emanated from the foul gasses of London’s polluted ...

John Snow is often called ... killing 550 people in two weeks. Snow interviewed residents and collected the addresses of people who had died, plotting the cases on a map. This led him to conclude ...