From: Idiopathic CD4 lymphocytopenia: a case of missing, wandering or ineffective T cells
Infections | HIV1,2 |
 | HTLV1, 2 |
 | Mycobacterial infections |
 | EBV, CMV |
Malignancies/hematologic conditions | Lymphoma |
 | Aplastic anemia |
 | Myelodysplastic syndrome |
Autoimmune | Systemic lupus erythematosus |
 | Sjögren's syndrome |
 | Kikuchi disease |
Medications | Chemotherapy and immunosuppressants |
 | Corticosteroids |
Genetic syndromes | XMEN |
 | WHIM |
 | Unc119 mutation |
Various | Sarcoidosis |
 | Common variable immunodeficiency |