Answer:
Prevalence rate
Explanation:
In epidemiology, the seriousness of a disease can be measured by the prevalence rate.
Prevalence rate refers to the number of new and old cases of disease in a population during a specified time regardless of when it first appeared.
It should not be confused by incidence rate. Incidence rate refers to the frequency of the number of new cases of a disease in a population at a specified time.
Prevalence rate shows or indicates how widespread the disease is whereas incidence will tell about the risk of contracting the disease.
