Definition: The body's sophisticated system of natural defense against infectious agants such as bacteria and viruses. However, in the case of HIV the virus attacks the immune system, weakening it and making the body more susceptible to opportunistic infections.
Immune System
From Mark Cichocki, R.N., former About.com Guide
Updated February 28, 2010
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
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