The prevalence rate is the number of new cases of a disease reported during a specific time period.

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The incidence rate can be contrasted with the prevalence rate, which is the proportion of the population affected by a disease at a specific point in time. Prevalence is thus determined by both the incidence rate and the length of the survival period in affected individuals. The incidence rate is the number of new cases of a disease reported during a specific period (typically 1 year) divided by the number of individuals in the population.

The Prevalence Rate Is the Number of New Cases of a Disease