Hyper Immunoglobulin M Immunodeficiency (Dysgammaglobulinemia): PRESENCE OF IMMUNOGLOBULIN M-SECRETING PLASMACYTOID CELLS IN PERIPHERAL BLOOD AND FAILURE OF IMMUNOGLOBULIN M-IMMUNOGLOBULIN G SWITCH IN B-CELL DIFFERENTIATION

^{Department of Pediatrics, Harvard Medical School, Boston, Massachusetts 02114}

^{Department of Medicine, Harvard Medical School, Boston, Massachusetts 02114}

^{Department of Pathology, Harvard Medical School, Boston, Massachusetts 02114}

^{Division of Allergy and Immunology, Department of Medicine, Children's Hospital Medical Center, Boston, Massachusetts 02114}

^{Department of Pathology, Children's Hospital Medical Center, Boston, Massachusetts 02114}

^{Infectious Disease Unit, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts 02114}

^{Department of Medicine, American University Medical Center, Beirut, Lebanon}

^{Department of Pediatrics, American University Medical Center, Beirut, Lebanon}

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^{Department of Pediatrics, Harvard Medical School, Boston, Massachusetts 02114}

^{Department of Medicine, Harvard Medical School, Boston, Massachusetts 02114}

^{Department of Pathology, Harvard Medical School, Boston, Massachusetts 02114}

^{Division of Allergy and Immunology, Department of Medicine, Children's Hospital Medical Center, Boston, Massachusetts 02114}

^{Department of Pathology, Children's Hospital Medical Center, Boston, Massachusetts 02114}

^{Infectious Disease Unit, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts 02114}

^{Department of Medicine, American University Medical Center, Beirut, Lebanon}

^{Department of Pediatrics, American University Medical Center, Beirut, Lebanon}

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^{Department of Pediatrics, Harvard Medical School, Boston, Massachusetts 02114}

^{Department of Medicine, Harvard Medical School, Boston, Massachusetts 02114}

^{Department of Pathology, Harvard Medical School, Boston, Massachusetts 02114}

^{Division of Allergy and Immunology, Department of Medicine, Children's Hospital Medical Center, Boston, Massachusetts 02114}

^{Department of Pathology, Children's Hospital Medical Center, Boston, Massachusetts 02114}

^{Infectious Disease Unit, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts 02114}

^{Department of Medicine, American University Medical Center, Beirut, Lebanon}

^{Department of Pediatrics, American University Medical Center, Beirut, Lebanon}

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^{Department of Pediatrics, Harvard Medical School, Boston, Massachusetts 02114}

^{Department of Medicine, Harvard Medical School, Boston, Massachusetts 02114}

^{Department of Pathology, Harvard Medical School, Boston, Massachusetts 02114}

^{Division of Allergy and Immunology, Department of Medicine, Children's Hospital Medical Center, Boston, Massachusetts 02114}

^{Department of Pathology, Children's Hospital Medical Center, Boston, Massachusetts 02114}

^{Infectious Disease Unit, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts 02114}

^{Department of Medicine, American University Medical Center, Beirut, Lebanon}

^{Department of Pediatrics, American University Medical Center, Beirut, Lebanon}

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^{Department of Pediatrics, Harvard Medical School, Boston, Massachusetts 02114}

^{Department of Medicine, Harvard Medical School, Boston, Massachusetts 02114}

^{Department of Pathology, Harvard Medical School, Boston, Massachusetts 02114}

^{Division of Allergy and Immunology, Department of Medicine, Children's Hospital Medical Center, Boston, Massachusetts 02114}

^{Department of Pathology, Children's Hospital Medical Center, Boston, Massachusetts 02114}

^{Infectious Disease Unit, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts 02114}

^{Department of Medicine, American University Medical Center, Beirut, Lebanon}

^{Department of Pediatrics, American University Medical Center, Beirut, Lebanon}

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^{Department of Pediatrics, Harvard Medical School, Boston, Massachusetts 02114}

^{Department of Medicine, Harvard Medical School, Boston, Massachusetts 02114}

^{Department of Pathology, Harvard Medical School, Boston, Massachusetts 02114}

^{Division of Allergy and Immunology, Department of Medicine, Children's Hospital Medical Center, Boston, Massachusetts 02114}

^{Department of Pathology, Children's Hospital Medical Center, Boston, Massachusetts 02114}

^{Infectious Disease Unit, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts 02114}

^{Department of Medicine, American University Medical Center, Beirut, Lebanon}

^{Department of Pediatrics, American University Medical Center, Beirut, Lebanon}

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