Which characteristic is NOT typical of endemic diseases?

Endemic diseases are typically characterized by their consistent presence in a given population or geographic area. This means that the disease is always present, albeit at a stable and often predictable level. The other characteristics of endemic diseases include a dependable incidence rate, meaning that the number of cases tends to remain relatively constant over time, and they often have a stable frequency within the population.

When we consider option B, which states that endemic diseases occur irregularly, it does not align with the definition of an endemic disease. An endemic typically exhibits a predictable pattern rather than irregular occurrences, which more accurately describes epidemic diseases that may surge and fluctuate dramatically in frequency. Therefore, the correct choice highlights the typical stability and consistency found in endemic diseases.