When your body encounters a germ, its first line of defense is your immune system. Specialized cells and organs help your body recognize and respond to foreign invaders. Your immune system even has its own circulatory system, called the lymphatic system.
If your immune system cannot do its job, the results can be serious. Disorders of the immune system include
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Date last updated: 16 September 2008 Topic last reviewed: 16 September 2008 |