The main causes of immunosuppression among these 29 cases were as follows: Human immunodeficiency viruses (HIV) infection with a low CD4 lymphocyte count (11 below 500 cells/mm3 and 1 below 200 cells/mm3; 12, 41.4%), autoimmune disease (8, 27.6%), malignancies (6, 20.7%), receiving oncology chemotherapy (2, 6.9%) and receiving transplants (3, 10.3%). Here, CD4 is linked to HIV infectious disease.