TABLE 2.

Features of immunosuppression in immunocompromised patients with pneumonia

Condition	n (%)
HIV	37 (13)
CD4+ lymphocyte count
<50	16 (6)
51–100	3 (1)
101–200	9 (3)
201–500	4 (1)
>500	5 (2)
Solid organ transplantation	43 (15)
Lung	13 (5)
Liver	6 (2)
Kidney	12 (4)
Heart	8 (3)
Heart-lung	1 (0.3)
Kidney-pancreas	3 (1)
Immune suppressive drug therapy*	38 (15)
Hematological malignancy	68 (24)
Acute myeloid leukemia	12 (4)
Acute lymphoblastic leukemia	1 (0.3)
Chronic myelogenous leukemia	4 (2)
Chronic lymphocytic leukemia	13 (5)
Multiple myeloma	14 (5)
Hairy cell leukemia	2 (1)
Hodgkin lymphoma	3 (1)
Non-Hodgkin lymphoma	14 (5)
Chemotherapy†	55 (19)
Marrow or stem cell transplantation‡	36 (13)
Chest radiation therapy§	7 (2)

^*Within three months of azathioprine, cyclophosphamide, methotrexate, cyclosporine or prednisone 15 mg/day (or equivalent) for 21 days;

^†Within six months of chemotherapy;

^‡Within one year of transplantation, or ongoing graft versus host disease;

^§Thoracic radiation within the past month