Although sporadic outbreaks of measles occur in the United States,the disease is considered nonendemic.What differentiates measles from endemic diseases,such as chickenpox?

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Endemic diseases have a permanent presence within a population, with a reservoir of the pathogen within the area. Diseases that are not endemic lack a reservoir in the area and may only appear sporadically. Measles is not considered endemic in the United States because it is not constantly circulating within the population, although occasional outbreaks may occur. Chickenpox, on the other hand, is endemic in the United States, as it is constantly present in the population and has a reservoir within the community. Therefore, the difference between measles and endemic diseases, such as chickenpox, is the presence or absence of a reservoir in the area.

Although Sporadic Outbreaks of Measles Occur in the United States,the