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This is because usually the immune system fights off infection so you don't get sick. However sometimes the immune system turns on the body and get make you very ill. These diseases that occur when the immune system turns against you are called autoimmune diseases. Some examples are immune mediated hemolytic anemia (when the immune system turns against the red blood cells) and immune mediated Arthritis.

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14y ago
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12y ago

From the Latin immunis, to be immune means exempt, not affected, or in the case of diseases, not infected.

Various cells in the body have chemical receptors which respond to non-human cells, proteins, and foreign chemicals. The system has three basic reactions: engulf and remove, engulf and destroy, or change the body's metabolism to cope with a foreign agent or organism.

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