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In epidemiology, an epidemic (from Greek epi- upon + demos people) is a classification of a disease that appears as new cases in a given human population, during a given period, at a rate that substantially exceeds what is "expected," based on recent experience (the number of new cases in the population during a specified period of time is called the "incidence rate"). (An epizootic is the analogous circumstance within an animal population.) In recent usages, the disease is not required to be communicable.
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Classification
Defining an epidemic can be subjective, depending in part on what is "expected". An epidemic may be restricted to one local (an outbreak), more general (an "epidemic") or even global (pandemic). Because it is based on what is "expected" or thought normal, a few cases of a very rare disease like rabies may be classified as an "epidemic," while many cases of a common disease (like the common cold) would not.
Endemic diseases
Common diseases that occur at a constant but relatively high rate in the population are said to be "endemic." An example of an endemic disease is malaria in some parts of Africa (for example, Liberia) in which a large portion of the population is expected to get malaria at some point in their lifetimes.
Non-infectious disease usage
The term "epidemic" is often used in a sense to refer to widespread and growing societal problems, for example, in discussions of obesity, mental illness or drug addiction. It can also be used metaphorically to relate a type of problem like those mentioned above.
Notable epidemics through history
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It has been suggested that Pandemic#Pandemics_and_notable_epidemics_through_history be merged into this article or section. () |
Famous examples of epidemics include HIV (present), the bubonic plague epidemic of Medieval Europe, known as the Black Death, and the Great Influenza Pandemic which coincided with the end of World War I.
Factors stimulating new epidemics
Factors that have been described by Mark Woolhouse and Sonya Gowtage-Sequeria to stimulate the rise of new epidemics [1] include:
- Alterations in agricultural practices and land use
- Changes in society and human demographics
- Poor population health (e.g. malnutrition, HIV, ...)
- Hospitals and medical procedures
- Evolution of the pathogen (e.g. increased virulence, drug resistance,)
- Contamination of water supplies and food sources
- International travel
- Failure of public health programs
- International trade
- Climate change
Several other factors have also been mentioned in different reports, such as the report by professor Andy Dobson [2] and the report by professor Akilesh Mishra [3].These include :
- Reduced levels of biodiversity (e.g. through environmental destruction)
- Bad urban planning
Pre-emptive measures
To protect us against the emergence of new epidemics, several preemptive measures have been proposed the World Health Organization [4].
Renewed concern
In August 2007, the World Health Organization reported an unprecedented rate of propagation of infectious diseases.[5]
References
- ^ "Emerging Infectious Diseases" by Mark E.J. Woolhouse and Sonya Gowtage-Sequeria
- ^ Andy Dobson blaming reduced levels of biodiversity as a epidemic-triggering factor
- ^ Akilesh Mishra blaming certain disease outbreaks on urban planning
- ^ http://whqlibdoc.who.int/hq/2004/WHO_CDS_CPE_ZFK_2004.9.pdf
- ^ "WHO warns of global epidemic risk". BBC News (2007-08-23). Retrieved on 2008-02-05.
See also
- List of epidemics
- Population control
- Overpopulation
- Pandemic
- Biosecurity
- OpenEpi
- Epi Info
- European Centre for Disease Prevention and Control
External links
- Video Discussion of the Prostate Cancer Epidemic
- Monash Virtual Laboratory - Simulations of epidemic spread across a landscape
Wikipedia content modification information:
- This page was last modified on 1 October 2008, at 18:06.
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