The exact incidence of Severe Combined Immunodeficiency (SCID) is unknown, except that it is recognized as rare in most population groups. It is believed that its incidence is in the neighborhood of 1 in 100,000. This number may vary though, due to misdiagnosis, unreported cases, and the like. SCID is actually a group of disorders. These diseases are either X - linked or autosomal recessive in inheritance. This means both parents must carry the defective chromosome for …showed first 75 words of 1520 total…

…showed last 75 words of 1520 total…connects with the patients target host cells, the reverse transcriptase makes a copy of the ADA gene, and inserts it into the DNA of the cell, thus making the host cell create more ADA. Most procedures use T- cells, or blood stem cells for retrovirus hosts, this is because they travel through, or have immediate access to the bloodstream, and live long, thus reducing the amount of times a year this procedure must be done.