14mo old male presents with frequent sino-pulmonary infx and pneumocystis carinii; elevated igm levels and deficiency in igg, iga and poor specific antibody responses to immunizations. dx?

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1. 14mo old male presents with frequent sino-pulmonary infx and pneumocystis carinii; elevated igm levels and deficiency in igg, iga and poor specific antibody responses to immunizations. dx?