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#Epidemic

In this story an [url=http://en.wikipedia.org/wiki/Epidemic]epidemic[/url] or [url=http://en.wikipedia.org/wiki/Pandemic]pandemic[/url] occurs. Epidemic occurs when new cases of a certain disease, in a given human population, and during a given period, substantially exceed what is expected based on recent experience. Generally, an epidemic occurs when host immunity to a parasite population is suddenly reduced. One of the reasons for this may be the emergence of new species of viruses, bacteria, etc. 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 a pandemic. In some fictional stories, the cause of the epidemic or pandemic can be the use of biological weapons. This may lead to a zombie apocalypse, or other interesting effects.

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