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study of cause, e.g., one may look at the syndrome of acquired immunodeficiency (AIDS) or the causal agents: human immunodeficiency viruses (HIVs).

Terminology

Concepts

In many cases, terms such as disease, disorder, morbidity, sickness and illness are used interchangeably; however, there are situations when specific terms are considered preferable.

;Disease
:The term disease broadly refers to any condition that

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