American Journal of Respiratory and Critical Care Medicine
https://www.atsjournals.org/doi/10.1164/rccm.200405-644ST
WEBHAP, VAP, and HCAP may be caused by a wide spectrum of bacterial pathogens, may be polymicrobial, and are rarely due to viral or fungal pathogens in immunocompetent hosts (9, 12, 27–32). Common pathogens include aerobic gram-negative bacilli, such as P. aeruginosa, Escherichia coli, Klebsiella pneumoniae, and Acinetobacter species.
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