Organism

Pneumonia in the immunocompromised host

AIDS: M. avium (31%), P. jirovecii (13%), CMV (11%), H. capsulatum (7%), S. pneumoniae (GPDC), H. influenzae (GNCB), P. aeruginosa (GNR), Enterobacteriaceae (GNR), C. neoformans, M. tuberculosis (AFB), other mycobacteria, C. immitis, P. marneffei, Rhodococcus equi (GPR).

Neutropenic: S. aureus (GPC), Pseudomonas sp. (GNR), Klebsiella sp ., enterobacter (GNR), Bacteroides sp. and other oral anaerobes, legionella, candida, aspergillus, mucor.

Transplant recipients: CMV (60–70%), P. aeruginosa (GNR), S. aureus (GPC), S. pneumoniae (GPDC), legionella (GNR), RSV, influenza virus, P. jirovecii, aspergillus, P. boydii, nocardia, strongyloides.