What is an epidemic
from Greek: epí - over and démos - people
A epidemic describes a highly frequent occurrence of a disease, especially an infectious disease, which is limited in time and place.
As Explosive epidemics are the steep rises and falls in the spread of the disease. This is the case, for example, if it spreads via drinking water. In contrast, is a Tardive epidemic characterized by a slow rise and fall in the number of cases of illness. The latter often applies to a disease that is transmitted through physical contact.
In contrast, an "endemic" describes a localized spread of a disease (usually an infectious disease). The increased prevalence of the disease in the affected area remains more or less the same.
A "pandemic" describes the spread of a certain disease that is geographically unlimited and affects a large part of the population over large areas and continents. This is the case with some influenza viruses and globally occurring diseases such as HIV or tuberculosis. Popularly, "endemic" and "pandemic" are often incorrectly referred to as "epidemic".
|locally limited||locally unlimited||locally limited|
An epidemic can occur if the R.0Value (see SIR model) is greater than 1.
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