Aetiological diagnosis in relation to the underlying immunosuppressed condition
| HSCT | Haematological malignancies | Solid organ transplantation | CIS | Total | |
| Bacterial | 6 (11%) | 16 (24%) | 18 (35%) | 8 (30%) | 48 (24%) |
| Viral | 11 (21%) | 6 (9%) | 1 (2%) | 2 (7%) | 20 (10%) |
| Fungal | 7 (13%) | 13 (19%) | 6 (12%) | 7 (26%) | 33 (17%) |
| Polymicrobial | 3 (6%) | 1 (2%) | 9 (17%) | 2 (7%) | 15 (7%) |
| Other infectious aetiologies2-151 | 1 (2%) | 3 (4%) | 1 (2%) | 4 (15%) | 9 (5%) |
| Pulmonary oedema | 3 (6%) | 3 (4%) | 10 (19%) | – | 16 (8%) |
| DAH | 5 (9%) | 2 (3%) | 2 (4%) | – | 10 (5%) |
| BOOP | 1 (2%) | 2 (3%) | – | 1 (4%) | 4 (2%) |
| Other non-infectious aetiologies2-152 | 3 (6%) | 4 (6%) | – | – | 7 (3%) |
| Undetermined | 13 (24%) | 17 (25%) | 5 (10%) | 3 (11%) | 38 (19%) |
HSCT = haematopoietic stem cell transplantation; CIS = chronic immunosuppressive treatment; DAH = diffuse alveolar haemorrhage; BOOP = bronchiolitis obliterans organising pneumonia.
↵2-151 Other infectious aetiologies include tuberculosis (n=5),P carinii pneumonia (n=4).
↵2-152 Other non-infectious entities include pulmonary involvement of Hodgkin's disease (n=3), drug toxicity due to bleomycin (n=2), alveolar proteinosis (n=1), and sarcoidosis (n=1).