Common Variable Immunodeficiency Support Group
Common variable immunodeficiency (CVID) is a group of 20-30 primary immunodeficiencies (PIDs) which have a common set of symptoms but with different underlying causes. CVID's underlying causes are different, but the result of these are that the body doesn't produce sufficient antibodies in response to exposure to pathogens.
In my own experience, before starting IVs, I had chronic staph infections of the skin, and it sometimes spread to other organs, which can be dangerous. I was tested for MRSA a few times, but it was always run-of-the-mill staph, so not as bad as what you are experiencing. Once I started on IgGIV, the infections have become very infrequent, and are never as severe. I have had to take antibiotics a couple of times, but the infection is much more easily controlled now.