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Immunoglobulin G4 subclass deficiency is the most common IgG subclass deficiency, followed by immunoglobulin G2 deficiency. However, IgG2 deficiency is the most common IgG subclass deficiency associated with recurrent infections. Immunoglobulin G4 subclass deficiency occurs in association with other isotype deficiencies. Isolated IgG4 deficiency, however, is much less common. Although respiratory...
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