Selective immunoglobulin A deficiency
Disease
Selective immunoglobulin A deficiency is a kind of immunodeficiency, a type of hypogammaglobulinemia. People with this deficiency lack immunoglobulin A, a type of antibody that protects against infections of the mucous membranes lining the mouth,... Wikipedia
The answer may be WHIM syndrome - it's more complex and variable than the acronym implies. Consider WHIM in your differential diagnosis - it...