John Snow's contribution to modern epidemiology

From our free online course, “PredictionX: John Snow & The Cholera Outbreak of 1854”:
https://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?

— Subscribe to our channel:    / @harvardonline  
— Sign up for emails about new courses: https://harvardx.link/email
— HarvardX courses on edX: https://www.edx.org/school/harvardx
— Harvard University's online courses: https://online-learning.harvard.edu/

HarvardX empowers the faculty of Harvard University to create high-quality online courses in subjects ranging from computer science to history, education, and religion.