Pulmonary infections are common and are caused by a wide range of organisms.
Micro-organisms responsible may enter the lung by three potential routes:
- most commonly due to inhalation of droplets of secretions from another infected human
- environmental exposure e.g. fungal spores
- direct injection e.g. intravenous drug use
- secondary seeding from distant infection e.g. infective bacterial endocarditis
Pulmonary infections may also be divided according to macroscopic appearances into:
- pulmonary abscess
- interstitial pneumonia
Alternatively, the causative agent may be used to categorize infections. Having said that, in many cases a particular agent may cause a number of radiographic and pathological appearances depending on the stage of the infection and on the immune status of the host.
Please refer to the following articles for discussion of specific entities:
- pulmonary viral infection
- pulmonary bacterial infection
- pulmonary mycobacterial infection
- pulmonary fungal infection