Which term describes the rate at which new cases develop during a specified period?

Which term describes the rate at which new cases develop during a specified period?

• A. Incidence
• B. Prevalence
• C. Morbidity
• D. Mortality

Answer: (A)

The main concept here is measuring how quickly a disease begins in a population. The rate at which new cases arise during a defined period is called incidence. It specifically counts people who were disease-free at the start and tracks how many develop the condition over the time frame, often expressed as cases per 1,000 or per 100,000 person-years. Prevalence, by contrast, counts all existing cases at a point in time or over a period, regardless of when they started. Morbidity refers to the overall burden of disease or illness in a population, not the rate of new cases, and mortality is the death rate from the condition. Since the question asks for the rate of new cases developing during a period, incidence is the best term.

The main concept here is measuring how quickly a disease begins in a population. The rate at which new cases arise during a defined period is called incidence. It specifically counts people who were disease-free at the start and tracks how many develop the condition over the time frame, often expressed as cases per 1,000 or per 100,000 person-years. Prevalence, by contrast, counts all existing cases at a point in time or over a period, regardless of when they started. Morbidity refers to the overall burden of disease or illness in a population, not the rate of new cases, and mortality is the death rate from the condition. Since the question asks for the rate of new cases developing during a period, incidence is the best term.