Aspiration of oral bacteria is associated with pneumonia, particularly in bedridden and hospitalized patients. Consider the following:
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Sørensen RT et al. Dysphagia screening and intensified oral hygiene reduce pneumonia after stroke. J Neurosci. 2013; 45(3): 139-146.
van der Maarel-Wierink CD et al. Oral health care and aspiration pneumonia in frail older people: a systematic literature review. Gerodontology. 2013; 30(1): 3-9.