[Importance of selective immunoglobulin A deficiency]

Area of Science:

• Immunology
• Clinical Medicine

Background:

• Selective IgA deficiency is the most common primary immunodeficiency, yet its pathogenesis remains poorly understood.
• The estimated incidence in Spain is 1:163, highlighting its prevalence.

Observation:

• Three cases diagnosed in Primary Care are presented.
• While often asymptomatic, selective IgA deficiency can be associated with recurrent respiratory infections, gastrointestinal, allergic, and autoimmune diseases.

Findings:

• No specific treatment currently exists for selective IgA deficiency.
• Key associations include celiac disease, idiopathic thrombocytopenic purpura, and a risk of anaphylaxis post-transfusion.

Implications:

• Early diagnosis and awareness of associated conditions are vital.
• Potential progression to Common Variable Immunodeficiency and careful vaccine selection due to disease risks are important considerations.