A 67-year-old man with severe COPD presents with increased sputum production, dyspnea, and wheezing. Vital signs show HR 102/min, RR 24/min, BP 138/86 mmHg, temperature 38.2°C, and SpO2 91% on room air. Sputum culture grows oxidase-positive, gram-negative diplococci. Chest X-ray shows no infiltrates. He denies recent hospitalization or antibiotic use. Which organism most likely caused this acute exacerbation?
- A)Neisseria meningitidis
- B)Kingella kingae
- C)Haemophilus ducreyi
- D)Bordetella pertussis
- E)Moraxella catarrhalisGABARITO
Explicação
Moraxella catarrhalis is correct. Moraxella is a gram negative diplococcus that commonly causes otitis media, sinusitis, and acute COPD exacerbations in older adults. The respiratory presentation in a patient with chronic lung disease is classic. Ver explicação completa e trilha adaptativa →