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A 70-year-old female was admitted to the hospital with a history of chills and fever (with a high temperature of 37.5 ℃) for 17 days. No obvious anomalies were detected on physical examination. Laboratory tests indicated white blood cells (6.96×109/L), neutrophil percentage (65％), C-reactive protein, and procalcitonin (0.766 ng/mL) in the normal range. The tests for liver function were normal, with Child-Pugh grade A, and the patient tested negative for hepatitis B virus infection.