1) Selective IgA Deficiency is the most common type of
immunodeficiency reported for Caucasian populations. It is also
strongly associated (by statistics, not because of co-location on a
chromosome) with multiple types of of autoimmune disorders,
including Graves Disease, Systemic Lupus Erythematosus, and Type I
Diabetes.
Given the concepts embedded in the Hygiene hypothesis and what
we have managed to figure out about the role of IgA in human
immunity, what does this observed association between IgA
deficiency and autoimmunity...