The baseline level of a disease that is usually present in a geographic area is called

• A. Endemic
• B. Epidemic
• C. Outbreak
• D. Pandemic

Answer: (A)

Endemic describes the baseline level at which a disease is regularly present in a geographic area. It means the disease is consistently found there at a predictable rate under normal conditions, without causing a large, unusual surge. This steady presence reflects the usual transmission dynamics, population immunity, and local factors like climate or vectors.

If cases rise well above that baseline in a particular area, we’d call it an epidemic; if the rise occurs across many areas or countries, it can become a pandemic. An outbreak refers to a sudden cluster of cases in a specific location that may or may not signal a larger epidemic. Example: malaria remains endemic in certain regions where transmission is ongoing year after year, while an unexpected spike in cases during a season would be considered an epidemic in that area.