What does ADA deficiency mean?

ADA deficiency meaning in Medical Dictionary

Lack of typical adenosine deaminase (ADA) activity, a genetic (hereditary) problem causing one form of severe combined immunodeficiency ((SCID) infection. It is said become "combined" for the reason that discover dysfunction of both B and T lymphocytes with weakened cellular immunity and reduced production of immunoglobulins. Adenosine deaminase is an enzyme that plays a key part in salvaging purine molecules.