Of those, 5 were immunocompromised patients; 2 had ulcerative colitis that required corticosteroids and immunomodulators; 1 had myasthenia gravis requiring corticosteroids; 1 had myeloid sarcoma that was being treated with allogenic stem cell transplantation; and, 1 patient had AIDS and a CD4 count of 1 cell/mm3. Here, CD4 is linked to myeloid sarcoma.