WORLD HISTORY

Detailed explanation-1: -By 1827 cholera had become the most feared disease of the century. The worldwide cholera epidemic was aided by the Industrial Revolution and the accompanying growth of urban tenements and slums.

Detailed explanation-2: -Poor workers were often housed in cramped, grossly inadequate quarters. Working conditions were difficult and exposed employees to many risks and dangers, including cramped work areas with poor ventilation, trauma from machinery, toxic exposures to heavy metals, dust, and solvents.

Detailed explanation-3: -Crowded cities meant poor ventilation, growing piles of rubbish and waste, and contaminated water that brought typhoid and diarrhea. Dark, damp, overcrowded apartments facilitated the spread of such airborne illnesses as influenza, pneumonia, and tuberculosis.

Detailed explanation-4: -An epidemic is a disease which spreads rapidly, affecting a large number of people within a community, population or region. An epidemic is usually clinically more severe than an endemic disease. Example: The Ebola epidemic in West Africa from 2014–2016.