![]() Rates of infection among clients of the distribution system drawing contaminated water far exceeded the, rates among those served by the company whose water intake was from above the contaminated section of the river. He further studied cholera in London homes that were receiving water from two water supply systems one from the sewage contaminated portion of the Thames River and the other that drew its water upstream from an uncontaminated part of the river. His thorough investigation of an epidemic in the Soho district of London led to his conclusion that contaminated water from the Broad Street pump was the source of the disease and, consequently, the removal of the handle led to cessation of the epidemic. John Snow conducted pioneering investigations on cholera epidemics in England and particularly in London in 1854 in which he demonstrated that contaminated water was the key source of the epidemics. Cholera was a major global scourge in the 19 th century, with frequent large-scale epidemics in European cities primarily originating in the Indian subcontinent. ![]()
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