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Empyema is a complication of community-acquired pneumonia. We conducted a retrospective analysis of empyema patients discharged from 1996 to 2016, examining culture results according to timing of antibiotic administration. Blood culture decreased from 45% to 4% after antibiotics, and pleural fluid culture yield decreased from 67% to 30%. More than half of methicillin-resistant Staphylococcus aureus cases occurred from 2011 to 2016.