Final answer:
An endemic disease exhibits a relatively steady frequency over a long period of time in a particular geographic locale.
Step-by-step explanation:
An endemic disease exhibits a relatively steady frequency over a long period of time in a particular geographic locale. These diseases are constantly present in a population within a specific region, usually at a low level of incidence.
For example, malaria is endemic to some regions of Brazil, meaning it is constantly present in those areas at a relatively stable rate. However, it is not endemic to the United States.