The sudden, unexpected occurrence of a disease, usually in a limited segment of a population, is called epidemic.
Epidemic is derived from the Greek word 'epi' means above and 'demos' means people.
The general definition of epidemic is an unexpected sudden increase in the number of diseased patients in a specific geographical area.
Yellow fever, smallpox, measles, and polio are prime examples of epidemics.
An epidemic disease doesn't necessarily have to be contagious. West Nile fever, obesity and diabetes rates increasing are also considered as epidemics.
sometimes epidemics can follow predictable patterns and these trends are often used to monitor, predict and control the spread of the infection. A typical example of this is seasonal flu.
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