A 56-year-old woman presented with fever and productive cough of 2 weeks in duration. Clinical examination revealed a thin, slightly tachypneic patient with temperature of 38.4°C, heart rate of 100 beats/min, and respiratory rate of 22 breaths/min. Her BP and arterial blood gas measurements were normal. There was no finger clubbing or lymphadenopathy. Chest examination revealed crackles at the upper third of both lung fields. She did not have a history of arrhythmias or heart failure, and cardiovascular examination was normal. The rest of the physical examination was unremarkable. Laboratory investigation revealed only leukocytosis (14,000/μL) and a raised C-reactive protein (35 mg/L). A tuberculin skin test result was negative, and sputum and blood culture findings were unremarkable.