This is one of the famous cases, in 1854: https://en.m.wikipedia.org/wiki/1854_Broad_Street_cholera_outbreak https://en.m.wikipedia.org/wiki/1854_Broad_Street_c

This is one of the famous cases, in 1854: https://en.m.wikipedia.org/wiki/1854_Broad_Street_cholera_outbreak https://en.m.wikipedia.org/wiki/1854_Broad_Street_cholera_ou... See Edward Tufte's take on it too http://www.ph.ucla.edu/epi/snow/tufte_snow.html http://www.ph.ucla.edu/epi/snow/tufte_snow.html