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The study of the incidence and spread of disease in large populations is called epidemiology. To control a disease, it is important to understand its source and how it spreads. Modern epidemiologists, for example, are trying to understand the origins and the spread of b human immunodeficiency virus (HIV), the virus that causes acquired immune deficiency syndrome (AIDS). They hope to one day manage and possibly even cure this deadly disease. However, understanding the nature of a disease is a difficult task, even using the latest tools of microbiology and molecular genetics. Imagine how difficult it was, then, hundreds of years ago, when medical knowledge had advanced little beyond superstition. At that time, the task of understanding a merciless disease must have seemed impossible.
Source: Microsoft ® Encarta ® 2009. © 1993-2008 Microsoft Corporation. All rights reserved.
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