John Snow`s work on Cholera

(1813 - 58)

Current theories included person to person contact and Miasma in 1854

Snow Plotted a map of all deaths from Cholera in Soho

Drew on the water pumps

Noted the cluster distribution round the Broad St. pump, (now called Broadwick St.)

Had the handle removed from the Broad St. pump

The epidemic ended

Demonstration of association to indicate aetiology

Lowered morbidity and mortality rates