1. The most common cause of community-acquired pneumonia in adults is Streptococcus pneumoniae.
2. A patient with pneumonia who develops a pleural effusion that is exudative and has a positive Gram stain for gram-positive diplococci likely has a parapneumonic effusion caused by Streptococcus pneumoniae.
3. The most appropriate initial antibiotic therapy for a patient with community-acquired pneumonia and no risk factors for drug-resistant organisms is a macrolide (e.g., azithromycin) or doxycycline.
4. A patient with pneumonia who is hypoxic and has bilateral infiltrates on chest X-ray may have acute respiratory distress syndrome (ARDS), which is a complication of severe pneumonia.
5. The most common cause of hospital-acquired pneumonia is Pseudomonas aeruginosa, especially in patients who are intubated or have prolonged hospital stays.
6. A patient with pneumonia who has a cavitary lesion on chest X-ray and a history of smoking may have lung cancer, which can present with pneumonia-like symptoms.
7. The most appropriate next step in management for a patient with pneumonia who is not improving after 48 hours of antibiotic therapy is to obtain blood cultures and consider changing antibiotics based on culture results.
8. A patient with pneumonia who has a positive sputum culture for Legionella pneumophila should be treated with a fluoroquinolone (e.g., levofloxacin) or a macrolide (e.g., azithromycin).
9. The most common cause of aspiration pneumonia is anaerobic bacteria, such as Bacteroides species.
10. A patient with pneumonia who has a history of travel to Southeast Asia and presents with fever, cough, and dyspnea may have avian influenza, which requires isolation and specific antiviral therapy.
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