Which disease is given as an example of an endemic disease?

• A. Yellow fever
• B. Malaria
• C. Influenza
• D. Tuberculosis

Answer: (A)

Endemic disease refers to a condition that is constantly present in a population or area at a relatively stable baseline level over time, due to ongoing transmission within that environment.

Yellow fever is a classic example because, in regions where it is endemic, the transmission cycle involving local mosquito vectors keeps the disease present year after year. There are always some cases occurring within the area, with occasional larger outbreaks when conditions favor transmission, illustrating the steady, persistent presence that defines endemicity.

Influenza tends to show regular seasonal epidemics rather than a constant baseline, and malaria and tuberculosis can be persistent as well but are often described in broader global contexts or with varying patterns by region. The example here aligns best with the concept of endemicity by highlighting a disease that remains continuously present in a defined locale due to local transmission.