Which physician discovered that contaminated water was the source of the cholera epidemic in London in 1854?

Robert Koch
Alexander Fleming
John Snow
Thomas Hodgkin
John Snow was an English physician and a leader in the adoption of anaesthesia and medical hygiene. He is considered one of the fathers of modern epidemiology, in part because of his work in tracing the source of a cholera outbreak in Soho, London, in 1854. His 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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Robert Koch
Alexander Fleming
John Snow
Thomas Hodgkin
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