A patient in the ICU following a motor vehicle accident has been intubated for 72 hours. Over the previous 12 hours, the patient’s oxygen requirement has increased, tidal volumes have decreased, and the patient’s endotracheal secretions have increased in quantity, thickness, and the color has changed from cloudy to green. The patient’s lab values are significant for a worsening respiratory acidosis and leukocytosis. Which diagnosis is most appropriate for this patient?

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