<unk>  is a very rare disease. In 1993, a total of 47 confirmed cases were reported in a survey sponsored by the Centers for Disease Control.
Idiopathic CD4+ lymphocytopenia
Persistent polyclonal B-cell lymphocytosis
Monoclonal B-cell lymphocytosis
X-linked lymphoproliferative disease
Thymic hypoplasia
Dermatopathic lymphadenopathy
Adult-onset immunodeficiency syndrome
CD25 deficiency