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.
http://en.wikipedia.org/wiki/Prebiotic_(nutrition)#Sources
http://www.ncbi.nlm.nih.gov/pubmed/8577022
http://www.ncbi.nlm.nih.gov/pubmed/11157345
http://www.ncbi.nlm.nih.gov/pubmed/8577022
http://www.tuzen.ca/irritable-bowel-syndrome.asp