NURSING ANM AND GNM

Detailed explanation-1: -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.

Detailed explanation-2: -John Snow, an anaesthetist, speculated that cholera was spread by contaminated water, an idea which was not accepted by his peers or local authorities. The dominant theory at the time was that cholera was spread by pollution or ‘bad air’.

Detailed explanation-3: -In fact, this was one of the reasons which led people to overlook the early work of the Italian scientist Fillipo Pacini who had proposed the germ-theory of cholera and identified the comma shaped organism as the cause of the disease in 1854.