Epidemic and pandemic are used to describe widespread outbreaks of a disease, but there are subtle differences between the two words.

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Epidemic

Pandemic

Definition An epidemic occurs when the incidence rate (i.e. new cases in a given human population, during a given period) of a certain disease substantially exceeds what is "expected," based on recent experience. A pandemic is an epidemic of an infectious disease that spreads through human populations across a large region, like a continent.
Comparison Disease outbreak that is concentrated in a particular region. Disease outbreak that occurs over a wide geographic area and affects a very high proportion of the population.

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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").

A pandemic (from Greek πᾶν (pan, “all”) + + δῆμος (dēmos, “the people”) is an epidemic that spreads across a large region (for example a continent), or even worldwide.

edit Differences Between an Epidemic and a Pandemic

Simply put, when an epidemic gets out of hand, it is called a pandemic. This has 2 nuances:

edit Video Explaining the Differences

In this video, Dr. Kenneth Alexander, chief of pediatric infectious diseases at the University of Chicago Medical Center, explains the differences between an outbreak, an epidemic, and a pandemic, and answers questions about the swine flu outbreak.

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"Epidemic vs Pandemic." Diffen.com. Diffen LLC, n.d. Web. 1 Jul 2015. < >