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Discover how the work of Dr. John Snow during the London cholera epidemic of 1853 led to the discovery of how the disease was transmitted, in this video [2:17] excerpt from the 2019 series Victoria, Season 3, Masterpiece. Challenging the prevailing theories of the time, Snow proved that polluted water was the source. His careful observations and recorded data led him to be later recognized as the "father of epidemiology."
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