Of the two terms used by social epidemiologists, incidence and prevalence, incidence refers to the number of new cases of a disease in a given year, while prevalence describes the geographical extent of the spread of the disease.

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Incidence refers to the number of new cases of a disease in a given period, while prevalence refers to the total number of cases of the disease present in the population at a specific time.

Of the Two Terms Used by Social Epidemiologists, Incidence and Prevalence