Because the lower respiratory tract is kept sterile by different pulmonary defense mechanisms,<unk> -acquired pneumonia connotes a breach of host defense mechanisms and/or overwhelming inoculation of virulent infectious agents. Modes of transmission include: macro- or micro-aspiration, circulation, local spead, traumatic inoculation, or iatrogenic. Impaired immunity and inability to filter out pathogens, as well as microbial virulence factors that impede immune clearance may increase the risk of developing<unk>  acquired pneumonia.
Community-acquired pneumonia pathophysiology
Aspiration pneumonia pathophysiology
Lipoid pneumonia pathophysiology
Community-acquired pneumonia risk factors
Air embolism pathophysiology
Hospital-acquired pneumonia causes
Aspiration pneumonia risk factors
Hypersensitivity pneumonitis risk factors