Serratia pneumonia.

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Abstract
The clinical and radiological manifestations were correlated with the necropsy findings in the lungs of 18 patients who died of S. marcescens infection. Ten died during a hospital epidemic affecting 74 patients. In 14, only Serratia was identified at autopsy; in 4, other organisms were also cultured. Ten patients had septicemia. The predominant radiological findings were focal bronchopneumonia in 13, lobar consolidation in 2 and diffuse nonhomogeneous infiltrates in 10. Small radiolucent areas within the infiltrates were seen in 5, a large pulmonary abscess in 1 and pleural effusion in 7. The predominant pathological findings were focal necrotizing bronchopneumonia (sometimes with microscopic abscesses) in 14 and diffuse hemorrhage in 3. Three patients had endocarditis and 3 others showed dissemination to the brain or kidneys.