Common | Bacteria | Pseudomonas aeruginosa | Enterobacteriaceae | Nocardia spp | Anaerobic bacteria and microaerophilic streptococci (eg, Streptococcus milleri) | Staphylococcus aureus | Mycobacteria | M. tuberculosis | M. kansasii | Fungi | Cryptococcus spp | Aspergillus spp | Histoplasma capsulatum | | Uncommon | Bacteria | Rhodococcus equi | Legionella spp | Mycobacteria | M. avium complex | Other nontuberculous mycobacteria | Fungi | Agents of mucormycosis | Blastomyces dermatitidis | Pneumocystis jirovecii (formerly P. carinii) | |