The practice of plotting case maps like this started during the 1854 cholera epidemic. The cholera case map helped discredit the theory that cholera was transm

The practice of plotting case maps like this started during the 1854 cholera epidemic. The cholera case map helped discredit the theory that cholera was transmitted by miasma, and supported the theory of fecal-oral transmission. Just some related history that you might find interesting. https://en.wikipedia.org/wiki/1854_Broad_Street_cholera_outbreak https://en.wikipedia.org/wiki/1854_Broad_Street_cholera_outb...