Which statement correctly defines endemic, epidemic, and pandemic with appropriate examples?

• A. Endemic only in animals
• B. Endemic constant presence; epidemic higher than expected; pandemic widespread across countries
• C. Epidemic constant presence
• D. Pandemic is localized outbreak

Answer: (B)

These terms describe how often a disease occurs and how widely it spreads. Endemic means a disease is continuously present in a population or area at a baseline level. For example, malaria remains regularly established in certain regions, year after year, without a sudden surge above what’s normally expected. Epidemic refers to a rise in cases that is higher than what’s normally expected in a specific place or population over a period of time. It’s an uptick, not a constant presence. Pandemic goes further, describing an outbreak that spreads across many countries or continents, affecting a large number of people, such as the global spread seen with COVID-19.

So the statement that ties these together—endemic as constant presence, epidemic as a higher-than-expected increase, and pandemic as widespread across countries—best matches these definitions. Some descriptions that say epidemics are the same as a constant presence, or that pandemics are just localized outbreaks, don’t fit how these patterns are defined or observed in public health.