John Snow's contribution to modern epidemiology 

From our free online course, “PredictionX: John Snow & The Cholera Outbreak of 1854”:
www.edx.org/course/prediction...
Dr. Rosalind Stanwell-Smith, Harvard Professor Don Goldman
John Snow's discovery that cholera is spread through water has taken on nearly mythological proportions. What is truth and what is myth about John Snow's contribution to modern epidemiology?
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