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.
Like Keli and the others I've found the best solution to prevent sinus infections is the low tech Nedi pot sinus rinse every day with just the saline, nothing else.
I didn't know there were antibacterial and antifungal sprays either. Interesting.