Nosocomial outbreak of severe Pseudomonas aeruginosa infections in haematological patients

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Abstract
From June to September 1988, an outbreak of Pseudomonas aeruginosa infections in neutropenic patients admitted to the Haematological Wards of “Ospedali Riuniti” in Bergamo, Italy, was detected. Out of 11 cases of P. aeruginosa infections, 8 were bacteremic. Of these, 7 died within few days of onset (mortality rate: 87.5%). Consequently, possible sources of infection were investigated, and moist areas of the hospital environment were shown to be highly contaminated by P. aeruginosa. A clinical and microbiological follow-up of patients admitted to the Haematological Wards was performed for a 10 month period following the outbreak. Adequate measures for cleaning and disinfection were shown to reduce the frequency of P. aeruginosa hospital infections.