Cholera was the great scourge of the 19th century. From 1817 to 1917, more than 40 million people worldwide died from the bacterial infection. One particular outbreak in London's Soho district changed how we fight the disease forever—but not before claiming the lives of more than 500 people in 10 days. At the center of it all was Dr. John Snow, the "father of epidemiology," who prevented an even worse outbreak, but whose ideas wouldn't be fully accepted for nearly 50 years.
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