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Immune Thrombocytopenia for Parents
Immune thrombocytopenia happens when the immune system attacks platelets. Viral infections often trigger this in children, but it usually goes away within 6 months.
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The Immune System for Teens
Learn what the parts of the immune system are, how they help the body fight off germs, and what immunity means.
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What Is Herd Immunity? for Parents
Herd immunity is when many people are immune to a contagious infection, so it's harder for that infection to spread in a community. Learn more.
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A to Z: Immune Thrombocytopenic Purpura for Parents
See: Idiopathic Thrombocytopenic Purpura.
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Immunizations for Parents
Do you know what vaccines your child needs and when? Find out here.
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Allergies & Immune System for Kids
Trouble with the immune system can cause some medical problems, like allergies. In this section, you can find out more about allergies and other immune system problems.
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Allergies & the Immune System for Parents
Learn all about allergic reactions and other problems of the immune system.
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Allergies, Asthma & the Immune System for Teens
This section has information on health problems that affect the immune system.
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What Are White Blood Cells? for Kids
White blood cells are part of the germ-fighting immune system.
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Diphtheria for Parents
Diphtheria is a bacterial infection that's rare in the United States, where health officials immunize kids against it. But it's still common in developing countries where immunizations aren't given routinely.