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- the state of being diseased (from Latin morbidus: sick, unhealthy),
- the degree or severity of a disease,
- the prevalence of a disease: the total number of cases in a particular population at a particular point in time,
- the incidence of a disease: the number of new cases in a particular population during a particular time interval.
Accordingly, the term morbidity rate can refer either to the incidence rate or to the prevalence rate of a disease. Compare with mortality rate, the number of people dying from a particular disease during a given time interval, divided by the total number of people in the population. Morbidity is often what is measured by ICU scoring systems.
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