Given that CVID arises from more than one gene, gene knock-out methods are unlikely to be helpful. It is necessary to seek out disease related polymorphisms by screening large populations of people with CVID, but this is challenging given the rarity of the disease. References
Moris G.; Garcia-Monco JC (1999). "The Challenge of Drug-Induced Aseptic Meningitis". Archives of Internal Medicine. 159 (11): 1185–1194. doi:10.1001/archinte.159.11.1185. PMID 10371226. (IVIG and Aseptic Meningitis, association with SLE)

External links

GeneReviews/NCBI/NIH/UW entry on Common Variable Immune Deficiency Overview Archived 2010-06-10 at the Wayback Machine
Enterocutaneous fistula: between the intestine and the skin surface, namely from the duodenum or the jejunum or the ileum. This definition excludes the fistulas arising from the colon or the appendix. Gastric fistula: from the stomach to the skin surface
(K38.3) Fistula of appendix
(K60) Anal and rectal fissures and fistulas
(K60.3) Anal fistula
(K60.5) Anorectal fistula (fecal fistula, fistula-in-ano): connecting the rectum or other anorectal area to the skin surface. This results in abnormal discharge of feces through an opening other than the anus. (K63.2) Fistula of intestine
Enteroenteral fistula: between two parts of the intestine
(K82.3) Fistula of gallbladder
(K83.3) Fistula of bile duct
Biliary fistula: connecting the bile ducts to the skin surface, often caused by gallbladder surgery
Pancreatic fistula: between the pancreas and the exterior via the abdominal wall

M: Diseases of the musculoskeletal system and connective tissue
(M25.1) Fistula of joint

N: Diseases of the urogenital system
(N32.1) Vesicointestinal fistula
(N36.0) Urethral fistula
Innora:between the prostatic utricle and the outside of the body
(N64.0) Fistula of nipple
(N82) Fistulae involving female genital tract / Obstetric fistula
(N82.0) Vesicovaginal fistula: between the bladder and the vagina
(N82.1) Other female urinary-genital tract fistulae
Cervical fistula: abnormal opening in the cervix
(N82.2) Fistula of vagina to small intestine
Enterovaginal fistula: between the intestine and the vagina
(N82.3) Fistula of vagina to large intestine
Rectovaginal: between the rectum and the vagina
(N82.4) Other female intestinal-genital tract fistulae
(N82.5) Female genital tract-skin fistulae
(N82.8) Other female genital tract fistulae
(N82.9) Female genital tract fistula, unspecified

Q: Congenital malformations, deformations and chromosomal abnormalities
(Q18.0) Sinus, fistula and cyst of branchial cleft
Congenital preauricular fistula: A small pit in front of the ear.