Selective IgA Deficiency

Immunoglobulin A (IgA) is a protein found in the blood. It protects the body against infections in the membranes (thin tissues) that line the airways, eyes, mouth and digestive system.

People with selective IgA deficiency don’t have this protein or have very low levels (deficiency) of the protein. Selective IgA deficiency is an immunodeficiency disease (a disease that involves a lack in the immune system). You might also see it called SIgAD.