A 61-year-old man was admitted to this hospital because of recurrent fevers. He had been well until approximately 3.5 months earlier, when chills, fevers, and fatigue developed. He had no cough or production of sputum. He saw his primary care physician, who sent him to the emergency department of another hospital. A chest radiograph revealed a left basilar opacity, and a diagnosis of community-acquired pneumonia was made. A 5-day course of azithromycin was begun. His symptoms persisted, and he was admitted to the same hospital 5 days later. A chest radiograph . . . Join discussion...