When more than the usual number of cases of a disease occurs in a population, the disease is said to be:

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When more than the usual number of cases of a disease occurs in a population, the disease is said to be an epidemic. Endemic refers to a disease that is regularly found in a specific population or region, while pandemic refers to a disease that has spread worldwide or across a large region. Epidemiologic refers to the study of patterns, causes, and effects of diseases in a population.

When More Than the Usual Number of Cases of a Disease