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John Snow Web of Causation Cholera Outbreak (London (Lack of toilets…
John Snow
Web of Causation Cholera Outbreak
Cholera
Fluids in your body evacuate in a short period of time
Everything fails
London
Largest city in the world
Lack of toilets
Lack of infrustructure
Lack of water supply
Epidemics started in 1832
John Snow
Believed cholera was contaminated water or food compared to the thought that it was contaminated air
Contaminated air: pulmonary symptoms
Contaminated water or food: gastrointestinal symptoms which exhibited in cholera
Tacked down people to confirm commonality of water use between people and the deaths that occured
Large businesses utilized water sources such as the Broad St. Pump
Higher incidence of cholera was seen
The Lion Brewery and a nearby work house utilized a private water supply
Decreased incidence of cholera was seen
Thourough investigation led John to find records of an infant that died of diarrhea around the same time as the beginning of the outbreak
Mother of the infant spoke about dumping a pail of the infant's diarrhea into the cesspool that lies adjacent to the water pump
The cesspool, within 3 feet of the well, was found leaking and the water was contaminated
Physician
Broad St. Pump
Found as the contaminant source of the outbreak. Pump handle was removed and incidences of cholera diminished