46 Adenosine deaminase deficiency (ada) is an inherited condition that affects the immune system and typically leads to severe combined immunodeficiency (scid). people with scid have a reduced or absent immune response which leaves them vulnerable to frequent bacterial, viral, and fungal infections. most people affected by ada develop symptoms of the condition before 6 months of age. however, approximately 10-15% of affected people have a "delayed" onset of symptoms; diagnosis of these cases, which are often less severe, typically takes place later in childhood (often between age 1 and 10) or even into adulthood. signs and symptoms of ada include pneumonia, chronic diarrhea, widespread skin rashes, slowed growth and/or developmental delay. ada is caused by changes (mutations) in the ada gene and is inherited in an autosomal recessive manner. the most effective treatment is transplantation of blood-forming stem cells from the bone marrow of a healthy person.[8061

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