Which statement best defines morbidity rate?

• A. The number of births in a population.
• B. A measure of disease incidence or prevalence in a population.
• C. The rate of vaccination in a population.
• D. The number of deaths in a population over a prescribed time.

Answer: (B)

Morbidity rate measures how much disease exists in a population, capturing how often people get sick (incidence) and, for point-in-time or period measures, how many people are sick at that moment (prevalence). This directly reflects the burden of illness in a community rather than the number of births, deaths, or vaccination activity. The best choice states that morbidity rate is a measure of disease incidence or prevalence in a population, which is precisely what morbidity captures. For example, if 500 new cases of a disease occur in a town of 100,000 over a year, that’s the incidence rate; if 1,500 people have the disease at a given time, that’s the prevalence rate.