Page "Industrial Revolution" Paragraph 121

The greatest killer in the cities was tuberculosis ( TB ).

According to the Harvard University Library, " By the late 19th century, 70 to 90 % of the urban populations of Europe and North America were infected with the TB bacillus, and about 80 % of those individuals who developed active tuberculosis died of it.

About 40 % of working-class deaths in cities were from tuberculosis.