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The constant presence or usual prevalence of a disease in a population within a geographic area is described by which term?
ASporadic
BPandemic
CEndemic
DEpidemic
Answer & Solution
Correct answer: C. Endemic
1. The amount of a disease usually present in a community is its baseline or endemic level.
2. Endemic therefore names constant presence or usual prevalence in a defined area.
3. Sporadic describes a disease occurring infrequently and irregularly, which is the opposite of constant.
4. Epidemic and pandemic both describe case numbers above the expected level, not the expected level itself.
_Source: CDC Principles of Epidemiology in Public Health Practice, 3rd Edition, section Level of Disease_
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