A 58-year-old man with acute leukemia undergoing induction chemotherapy develops persistent fever (38.5°C) and a new pulmonary infiltrate on chest X-ray despite 5 days of broad-spectrum antibiotics (piperacillin-tazobactam + amikacin). Blood and respiratory cultures remain negative. Serum galactomannan antigen is positive. What is the most appropriate immediate next step?

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