Broadwick Street (formerly Broad Street) is a street in Soho, City of Westminster, London. It runs for 0.18 miles (0.29 km) approximately west-east between Marshall Street and Wardour Street, crossing Berwick Street. Broad Street was notorious as the centre of an 1854 outbreak of cholera. Dr John Snow traced the outbreak to a public water pump on the street and disabled the pump. The end of the outbreak swiftly followed. Before this time, the disease was widely thought to be caused by air-borne miasma; Snow's findings showed it to be water-borne.