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Primary Immune Deficiency Diseases

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Talking to Your Doctor

Take Action: When Your Immune System Fails You

We rely on our immune system to fight harmful bacteria or viruses—either on its own or with the help of antibiotics or antivirals—every day. Most of us recover quickly from infectious illnesses, and our immune system helps protect us from repeat infections in the future.

People with primary immune deficiency diseases (PIDDs), however, have an inborn defect in one or more parts of their immune system. They often cannot overcome infections, even with the aid of medicine.

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Last Updated July 17, 2012