Enterobacterspecies have not been well recognized as important lower respiratory tract pathogens. We describe 11 cases ofEnterobacterpneumonia, seven diagnosed by transtracheal aspiration and four by simultaneous blood and sputum cultures. The infections were usually nosocomial, and were fatal in five patients. Our patients were old (mean age 65 plusmn; 12.3 years) with chronic obstructive pulmonary disease (COPD) as a common underlying disease.Enterobacterspecies are important pathogens causing nosocomial pneumonias, especially in elderly patients with COPD.
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