Increasing understanding about the causes of disease (3.1) 0.0 / 5 ? HistoryModern Britain from 1750A2/A-levelEdexcel Created by: Ellief_2000Created on: 03-05-18 13:28 The miasma theory 19th century belief 'bad air' diseases caused by the presence of a posinous gas in the air minute particles of decaying matter were carried in the air and caused a foul smell diseases were spread because the posinous gases were carried from perosn to person and place to place in the air industrilaisation had created many filthy, foul smelling areas in most cities. It was int hese areas in which disease was most common 1 of 3 The germ theory scientiss became interested in decaying matter and the maggots and flies that lived on and in it the development of the microscope by Joseph Lister in 1830 enbaled them to observe micro-organisms in rotting material there were two ideas: the decaying material created the micro-organisms and that micro-organisms in the air were attracted to the decaying material 2 of 3 Which theory was correct? 1860 - Pasteur conducted experiments proving that micro-organisms existed in the air and were not created by the decaying material he dicovered that a disease in silkworms was caused by a particular micro-organism not everyone believed him many influential people were slow to let go of the miasma theory Robert Koch proved in the 1880s and 1890s that germs caused most of the killer diseases of the 19th century 3 of 3
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