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Figure 1. Serial Chest Radiographs Obtained from Patient 1.

A chest radiograph obtained at admission revealed a small focal pulmonary infiltrate in the right middle zone (Panel A). A chest radiograph obtained two days later showed minimal progression of the infiltrate (Panel B). On day 3, the pneumonia had progressed to involve most of the right middle zone (Panel C), and further progression was noted on day 4 (Panel D) and day 6 (Panel E), the day the patient died.