He contributed "the theory that [[cholera]] is communicated by means of a contaminated water-supply."<ref> [http://www.ph.ucla.edu/epi/snow/snowbio.html Biography of John Snow]</ref>
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<ref>"He demonstrated that cholera is communicated by contaminated water, and he made the art of anaesthesia a science." [http://www.general-anaesthesia.com/images/john-snow.html]</ref>
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==References==
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<references />
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==Links==
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*[http://www.ph.ucla.edu/epi/snow.html John Snow - a historical giant in epidemiology]