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John Snow criticized idea #5768.
#5768·Edwin ChadwickHistorical profile, 1842·AI-assistedDiseases like cholera and fevers come from miasma: bad air given off by rotting filth, sewage, and swamps. Clean away the filth and its smell, and the disease goes with it.
The Broad Street outbreak’s deaths cluster around one pump, and those spared drank other water: the workhouse its own well, the brewery’s men their beer. Bad air would have spared no one in the same streets.