In 1854, during a cholera epidemic in London, plotting each case on a map allowed epidemiologists to identify the geographic center of disease concentration and eventually trace the source to contaminated water, demonstrating that visualization can reveal patterns invisible in raw patient records.
factualpending
Evidence Quote
“they plotted every case on the map... by looking at the map you can see that certainly is kind of center of the disease happening and they eventually located as well with the water was contaminated”
Created: 8/13/2026, 7:43:31 AM
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