Concept
Epidemic
Overview
An epidemic (from Greek ἐπί epi "upon or above" and δῆμος demos "people") is the rapid spread of disease to a large number of hosts in a given population within a short period of time. For example, in meningococcal infections, an attack rate in excess of 15 cases per 100,000 people for two consecutive weeks is considered an epidemic.
Epidemics of infectious disease are generally caused by several factors including a change in the ecology of the host population (e.g., increased stress or increase in the density of a vector species), a genetic change in the pathogen reservoir or the introduction of an emerging pathogen to a host population (by movement of pathogen or host). Generally, an epidemic occurs when host immunity to either an established pathogen or newly emerging novel pathogen is suddenly reduced below that found in the endemic equilibrium and the transmission threshold is exceeded.
An epidemic may be restricted to one location; however, if it spreads to other countries or continents and affects a substantial number of people, it may be termed as a pandemic. The declaration of an epidemic usually requires a good understanding of a baseline rate of incidence; epidemics for certain diseases, such as influenza, are defined as reaching some defined increase in incidence above this baseline. A few cases of a very rare disease may be classified as an epidemic, while many cases of a common disease (such as the common cold) would not. An epidemic can cause enormous damage through financial and economic losses in addition to impaired health and loss of life.
Overview adapted from Wikipedia (CC BY-SA 4.0; see the article history for authors).
In the original texts
Passages from public-domain books where Epidemic is discussed.
The ancient physicians commonly used the term Epidemic in the same sense as it is understood now, that is to say, as applying to any disease which attacks a multitude of persons in a locality at any particular period. This, as will be seen in our annotations below, is nearly the definition which Galen gives of it; and it is generally used by Hippocrates, in the first and third books of the “Epidemics,” in pretty…
Hippocrates, The genuine works of Hippocrates, Vol. 1
names the idea; talks about the author, not by them; states what it is; opens on it
But the fury of the epidemic in all former periods seems to have been child's play in comparison with its ravages after the crisis of 1842. One- sixth of the whole indigent population of Scotland was seized by the fever, and the infection was carried by wandering beggars with fearful rapidity from one locality to another. It did not reach the middle and upper classes of the population, yet in two months there were…
Friedrich Engels, The Condition of the Working-Class in England in 1844 with a Preface written in 1892
names the idea; opens on it
When a species, owing to highly favourable circumstances, increases inordinately in numbers in a small tract, epidemics—at least, this seems generally to occur with our game animals—often ensue: and here we have a limiting check independent of the struggle for life. But even some of these so-called epidemics appear to be due to parasitic worms, which have from some cause, possibly in part through facility of…
Charles Darwin, On the Origin of Species By Means of Natural Selection
names the idea; opens on it
We find, in consequence of the penance and redemption-training, awful epileptic epidemics, the greatest known to history, such as the St. Vitus and St. John dances of the Middle Ages; we find, as another phase of its after-effect, frightful mutilations and chronic depressions, by means of which the temperament of a nation or a city (Geneva, Bale) is turned once for all into its opposite;--this _training_, again, is…
Friedrich Wilhelm Nietzsche, The Genealogy of Morals The Complete Works, Volume Thirteen, edited by Dr. Oscar Levy.
names the idea; opens on it
In these crises a great part not only of the existing products, but also of the previously created productive forces, is periodically destroyed. In these crises there breaks out an epidemic that, in all earlier epochs, would have seemed an absurdity--the epidemic of overproduction.
Karl Marx, Manifesto of the Communist Party
names the idea
Philosophers who discussed Epidemic
Related ideas
- Hippocrates
- Homer
- Ancient Greek
- Antibiotic
- Virus
- Influenza
- Mutation
- Odyssey
- Pandemic
- Tanzania
- Thucydides
- Pathogen
- Epidemiology
Place in the tradition
Part of Philosophy of war.