Clinical problem-solving. Keeping an open mind.

A 67-year-old man presented with a 3-month history of fatigue and fever. He had undergone heart transplantation 6 years earlier for idiopathic cardiomyopathy. He reported no weight loss, night sweats, or chills. He also reported no headache, rash, joint swelling, dysuria, or abdominal or respiratory problems.

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