The germ theory of disease refers to the discovery in the late 19th century that some infectious diseases are caused by microorganisms, small organisms too small to see without magnification, that invade the host. The theory supplanted earlier explanations for disease such as miasma theory.
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Famous quotes containing the words germ, theory and/or disease:
“In the Original Unity of the First Thing lies the Secondary Cause of All Things, with the Germ of their Inevitable Annihilation.”
—Edgar Allan Poe (1809–1849)
“A theory if you hold it hard enough
And long enough gets rated as a creed....”
—Robert Frost (1874–1963)
“There is a disease to which plays as well as men become liable with advancing years. In men it is called doting, in plays dating. The more topical the play the more it dates.”
—George Bernard Shaw (1856–1950)