?:definition
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A genetically heterogenous group of conditions characterized by decreased levels of IgG, IgA, and IgE, and normal or increased levels of IgM. Patients are at an increased risk of infections and development of malignancies.
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An immunodeficiency state characterized by very low serum IgG and IgA but either a normal or, more frequently, a markedly elevated concentration of polyclonal IgM.
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