Can also be monomicrobial, caused by Klebsiella, Staphylococcus aureus, Pseudomonas aeruginosa, Burkholderia pseudomallei (melioidosis), Pasteurella multocida, group A streptococcus, Haemophilus influenzae types b and c, Legionella spp., Rhodococcus equi, Actinomyces spp., and Nocardia spp.
Pathophysiology
Mostly from chronic aspiration
Risk Factors
Chronic aspiration from any etiology
Alcohol use disorder
Seizures, stroke, drug overdose, general anesthesia
Dysphagia or respiratory dysfunction from ALS, Parkinson’s disease, or stroke
