A 55-year-old man presents 3 days after attending a large hotel convention with high fever (39.2°C), productive cough, diarrhea, confusion, and progressive shortness of breath. Vital signs: BP 118/76, HR 108, RR 22, SpO2 92% on room air. Laboratory studies reveal hyponatremia (128 mEq/L) and chest X-ray shows patchy lower lobe infiltrates. Gram stain of sputum reveals no organisms. He denies recent antibiotic use. Which organism is most likely responsible?
- A)Mycoplasma pneumoniae
- B)Legionella pneumophilaGABARITO
- C)Streptococcus pneumoniae
- D)Klebsiella pneumoniae
- E)Chlamydophila psittaci
Explicação
Legionella causes an atypical pneumonia associated with water sources, hotel outbreaks, diarrhea, confusion, and hyponatremia. It stains poorly on routine Gram stain and can be detected with urinary antigen testing. Macrolides or fluoroquinolones are standard ... Ver explicação completa e trilha adaptativa →