EPM101 Fundamentals of Epidemiology
Epidemiology Taster Session

Historical Evolution of Epidemiology

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Based on these observations, John Snow formulated an hypothesis on the nature and mode of communication of cholera:

There was no further cholera in London until 1853. During this period, the Lambeth company moved its source so that it now drew water from the Thames upstream of London (and thus uncontaminated by London sewage). The Southwark and Vauxhall company continued to draw water from the Thames in London. This provided John Snow with an ideal opportunity to test his hypothesis.