Prevalence is best described as?

• A. Rate of new infections
• B. Total existing cases at a point in time
• C. New cases developing during a period
• D. Mortality rate

Answer: (B)

Prevalence shows how widespread a condition is at a specific moment by counting everyone who already has the disease at that time. It’s a snapshot of existing cases, not new ones or deaths. That’s why the best description is the total existing cases at a point in time. Incidence refers to new cases over a period, and mortality rate is about deaths. In practice, prevalence can be shown as a proportion or rate and can vary with disease duration—long-lasting diseases tend to have higher prevalence, while acute, short-duration conditions often show lower prevalence.