John Snow (15 March 1813 – 16 June 1858) was an English physician and a leader in the development of anaesthesia and medical hygiene. He is considered one of the founders of modern epidemiology and early germ theory, in part because of his work in tracing the source of a cholera outbreak in London's Soho, which he identified as a particular public water pump. Snow's findings inspired fundamental changes in the water and waste systems of London, which led to similar changes in other cities, and a significant improvement in general public health around the world.
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In this Dossier
John Snow in the context of Human geography
Human geography, also known as anthropogeography, is a branch of geography that studies how people interact with places. It focuses on the spatial relationships between human communities, cultures, economies, people, lifestyle and their environments. Examples include patterns like urban sprawl and urban redevelopment. It looks at how social interactions connect with the environment using both qualitative (descriptive) and quantitative (numerical) methods. This multidisciplinary field draws from sociology, anthropology, economics, and environmental science, helping build a more complete understanding of how human activity shapes the spaces we live in.
John Snow in the context of Cluster (epidemiology)
A disease cluster is an unusually large aggregation of a relatively uncommon disease (medical condition) or event within a particular geographical location or period. Recognition of a cluster depends on its size being greater than would be expected by chance. Identification of a suspected disease cluster may initially depend on anecdotal evidence. Epidemiologists and biostatisticians then assess whether the suspected cluster corresponds to an actual increase of disease in the area. Typically, when clusters are recognized, they are reported to public health departments in the local area. If clusters are of sufficient size and importance, they may be re-evaluated as outbreaks.
John Snow's pioneering investigation of the 1854 cholera outbreak in Soho, London, is seen as a classic example of the study of such a cluster.
John Snow in the context of 1854 Broad Street cholera outbreak
A severe outbreak of cholera occurred in 1854 near Broad Street (now Broadwick Street) and Golden Square in Soho, London, England, during the worldwide 1846–1860 cholera pandemic. The outbreak (also known as Golden Square outbreak), which killed 616 people, is best known for the physician John Snow's study of its causes and his hypothesis that germ-contaminated water was the cause, rather than something in the air called "miasma". This discovery influenced public health and the construction of improved sanitation facilities beginning in the mid-19th century. Later, the term "focus of infection" was used to describe sites, such as the Broad Street pump, where conditions are favourable for transmission of infection. Snow unknowingly took advantage of a natural experiment during his endeavours to identify the cause of cholera transmission.