男孩，3岁，生后反复患肺炎、腹泻、脑膜炎，2周前因患败血症死亡。曾化验血清IgG7.6g/L,IgA760g/L,IgM56mg/L,细胞免疫功能测定正常，外周血淋巴细胞数正常，骨髓找到浆细胞。最可能的诊断是

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