[IgE deficiency: a forgotten disease?].

Background: Selective IgE deficiency is a profound deficiency (< 5 UI/mL) or absence of serum IgE levels without other immunologic abnormalities. It is usually asymptomatic, but may be associated with recurrent respiratory infections, chronic fatigue, and musculoskeletal complaints.

Objective: To describe the evolution and treatment in patients with selective IgE deficiency.