" ...if we are to keep alive the model of sustainable metropolitan life that Snow and Whitehead helped make possible 150 years ago, it is incumbent on us to do, at the very least, two things.
The first is to embrace—as a matter of philosophy and public policy—the insights of science...
The second is to commit ourselves anew to the kinds of public health systems that developed in the wake of the Broad Street outbreak, both in the developed world and the developing: clean water supplies, sanitary waste-removal and recycling systems, early vaccination programs, disease detection and mapping programs. Cholera demonstrated that the nineteenth-century world was more connected
than ever before; that local public-health problems could quickly reverberate around the globe. "

― Steven Johnson , The Ghost Map: The Story of London's Most Terrifying Epidemic—and How It Changed Science, Cities, and the Modern World