Here is a very informative link about IGG subclass immunodeficiency.
http://primaryimmune.org/about-prim...ecific-disease-types/igg-subclass-deficiency/
I didn't even know I had it until my allergist ran this screening. To test for it I was given the pneumonia vaccine then a couple of weeks later had blood drawn to see if I produced antibodies. What little I produced had no therapeutic level. Then he ran the subclass blood work again and I had the same results, deficient in one to two subclasses ( I can't remember which ones).
Anyway, since I wasn't getting very many infections we are just leaving things alone. BUT now that I'm taking Humira that may make my deficiencies worse. I have already had one pretty good chest infection with asthma.
Treatment is IV gamma globulin replacement. Not even going to entertain this unless my deficiencies are near zero!! I just had blood work drawn to check all this since I've been 6 weeks on Humira. I should know the results by Wednesday.
I see an allergist/ immunologist because I am allergic to 5 bees ( got stung and had anaphylactic response) and many pollen and animal allergies. Asthma to boot ( was hospitalized 3 times before I agreed to allergy shots). Did you know there is a strong link between asthma and Crohn's?
It all has to do with the immune system.