MCQ – 87791


A 45-year-old man with colon cancer is treated with chemotherapy. Two months later, he develops increasing cough and respiratory distress. A chest X-ray shows diffuse bilateral interstitial infiltrates. Sputum cultures are negative, and the patient does not respond to antibiotic therapy. A lung biopsy reveals acute and chronic interstitial pneumonitis. There are enlarged cells with prominent, dark-blue nuclear inclusions as shown in the image). Which of the following is most likely responsible for this patient’s pulmonary condition?



B. Herpes simplex virus


Epstein-Barr virus


Pneumocystis jiroveci

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