NCIt definition : A loss of any arm of immune functions, resulting in potential or actual increase in
infections. This state may be reached secondary to specific genetic lesions, syndromes
with unidentified or polygenic causes, acquired deficits from other disease states,
or as result of therapy for other diseases or conditions.;
Alternative definition : NICHD: A loss of any arm of immune functions resulting in potential or actual increase
in infections. This state may be reached due to specific genetic lesions, syndromes
with unidentified or polygenic causes, acquired deficits from other disease states,
or as result of therapy for other diseases or conditions.; NCI-GLOSS: Having a weakened immune system caused by certain diseases or treatments.;