Pulmonary Infections — Community & Hospital-Acquired
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Clinical VignetteQuestion 1 of 24
Worse Than She Looks
A 19-year-old female college student presents with a 3-week history of gradually worsening dry cough, low-grade fevers, and fatigue. Several dormmates have had similar illnesses over the past month. She appears mildly ill and is not in respiratory distress. Vital signs: temperature 38.0°C, heart rate 90 bpm, oxygen saturation 96% on room air. Lung examination reveals faint bilateral crackles. Chest X-ray shows bilateral infiltrates without focal consolidation. Sputum is collected and a Gram stain is performed, which shows a scant number of inflammatory cells and no identifiable organisms.
Which of the following organisms is the most likely cause of this patient's pneumonia?