https://www.aaaai.org/tools-for-the-public/allergy,-asthma-immunology-glossary/selective-iga-deficiency-defined
AAAAI explains Selective IgA Deficiency is the most common primary immunodeficiency disease (PIDD).
selective iga deficiencydefinedaaaai
https://www.mayoclinic.org/diseases-conditions/selective-iga-deficiency/doctors-departments/ddc-20362242
A lack of the disease-fighting antibody called immunoglobulin A (IgA) may cause frequent infections or serious complications.
selective iga deficiencymayo clinicdoctorsdepartments