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Hyper IgM syndrome 4: Hyper IgM syndrome is a rare inherited immunodeficiency disorder which causes frequent infections involving the ears, eyes, sinuses, lungs, skin, respiratory tract and other areas of the body. Type 4 does not involve an increased risk of opportunistic infections and is caused by a defect on chromosome 4. More detailed information about the symptoms, causes, and treatments of Hyper IgM syndrome 4 is available below.
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