Which antibiotic is appropriate for aspiration pneumonia?

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Aspiration pneumonia arises from inhaled oropharyngeal contents that harbor anaerobic bacteria, so effective empiric therapy must cover anaerobes and the usual oral flora. Amoxicillin-clavulanate provides strong anaerobic coverage (including common oral anaerobes) while also hitting many aerobic pathogens encountered in aspiration events, making it a suitable first-line option for community-acquired aspiration pneumonia. The other items aren’t antibiotics or aren’t appropriate for addressing the infectious agents involved here—ribavirin is an antiviral, cytomegalovirus is a viral pathogen, and while Klebsiella can cause pneumonia, choosing an antibiotic that covers anaerobes is key in aspiration cases, which amoxicillin-clavulanate does.