Final answer:
The CDC classifies a disease that is constantly present in a community as an endemic disease, which maintains a relatively stable presence within a population over time.
Step-by-step explanation:
The Centers for Disease Control and Prevention (CDC) would classify a disease that is constantly present in a community as an endemic disease.
An endemic disease is one that is always present in a population, typically at a steady frequency and level of incidence. For example, malaria is often considered endemic in certain tropical regions where it is transmitted throughout the year by mosquitoes, rather than occurring in occasional outbreaks.