Which is the best definition of "epidemic"?

The term "epidemic" is defined as the occurrence of a large number of cases of a disease in a specific geographic area over a particular time frame. This definition emphasizes a significant increase in disease cases compared to what is normally expected in that population or region.

When an outbreak occurs and the number of cases rises sharply, it indicates a spread that exceeds expected baseline levels. This definition is crucial in public health for identifying situations that need immediate attention and intervention to control the spread of the disease.

Isolated cases of disease, moderate levels of disease, or chronic conditions do not fit the definition of an epidemic, as these do not imply an unexpected surge or widespread outbreak. Therefore, understanding and recognizing the characteristics of an epidemic is essential for effective public health response and management of infectious diseases.