Some patients with immunodeficiency develop clinical features of autoimmune disorders. A previously asymptomatic antibody deficiency can underlie the development of autoimmune diseases and a severe course of infection, with a risk of sepsis; such cases are known in selective IgA deficiency. On the other hand, little information is available on selective IgG subclass deficiencies. An unexpectedly severe course of Campylobacter infection in a 19-year-old woman with a previously undiagnosed complex immune disorder, including selective IgG1 immunodeficiency, Hashimoto's autoimmune thyroiditis with hypothyroidism combined with Addison's disease presumably due to autoimmune adrenalitis, autoimmunity and allergy is described. The pathophysiological mechanisms of autoimmunity in latent humoral defects are discussed.

Institute of Clinical Immunology and Allergology University Hospital Hradec Králové Charles University Prague Faculty of Medicine in Hradec Králové Czechia

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