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Monday, December 06, 2004

Frequency of Disease

Epidemiology is important concerning causes and frequency of disease. The vocabulary of the frequency of disease is as follows..

INCIDENCE is the number of new cases in a certain population.
PREVALENCE includes both the number of old and the number of new cases combined.
(Both of the previous are expressed as a ratio of the number of cases divided by the number of people at risk)
Incidence = # of new cases/# of people at risk
Prevalence = # of old and new cases/# of people at risk
SPORATIC disease is considered when only a few cases occur within a population .
ENDEMIC diseases occur at a regular frequency within geographical distribution.
EPIDEMIC disease occurs at a greater frequency than usual within a population or area.
PANDEMIC disease is referred to as one that occurs simultaneously on more than one continent. (AIDS is considered pandemic worldwide)






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