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____________________ is the rate including only new cases occurring within defined time period (usually a year).

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Final answer:

Incidence is the number of new disease cases that occur within a period of time, while prevalence includes both new and existing cases of a disease in a population over time.

Step-by-step explanation:

In the context of disease, incidence is the number of new cases of a disease that occur within a defined time period, usually a year. It measures the risk of developing the disease. Prevalence refers to the total number of both new and existing cases of a disease in a population over time. It provides an indication of the overall health of the population during that time period.

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