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Epidemiology of endemic Pseudomonas aeruginosa: why infection control efforts have failed
Abstract:
The epidemiology of Pseudomonas aeruginosa was evaluated in an intensive care unit for a period of six months by means of serial surveillance and environmental cultures. One hundred (37%) of 270 patients were noted to be colonized: 63 at the time of their admission and 37 during their stay on the unit. Colonization at the time of admission was associated with length of hospitalization before admission to the intensive care unit, age, gastrointestinal disease, and prior use of antibiotics. The strains acquired on the intensive care unit represented several different serotypes, with little clustering; the source of most strains was not found. In only 12 cases did the acquisition of P. aeruginosa appear to represent cross-infection; the use of barrier isolation could have prevented at most five of these cases. Undetected endogenous gastrointestinal carriage may have been responsible for many other apparent acquisitions. Clinical infection in association with preceding gastrointestinal colonization developed in 20 patients. The data indicate that traditional control measures aimed at the prevention of exogenous acquisition of P. aeruginosa are unlikely to have an impact on the overall incidence of infection and that efforts to prevent infection in patients who are already colonized are necessary.
Insights
Pseudomonas aeruginosa colonization is common in intensive care units, often originating from patients
Area of Science:
- Infectious Diseases
- Epidemiology
- Critical Care Medicine
Background:
- Pseudomonas aeruginosa is a significant opportunistic pathogen in healthcare settings.
- Intensive care units (ICUs) are high-risk environments for the acquisition and transmission of multidrug-resistant organisms.
- Understanding the epidemiology of P. aeruginosa colonization and infection is crucial for effective control strategies.
Purpose of the Study:
- To investigate the epidemiology of Pseudomonas aeruginosa colonization and infection in an intensive care unit.
- To identify risk factors associated with P. aeruginosa colonization upon admission and during ICU stay.
- To evaluate the sources and transmission patterns of P. aeruginosa within the ICU environment.
Main Methods:
- Conducted a six-month prospective surveillance study in an intensive care unit.
- Utilized serial patient surveillance cultures and environmental sampling.
- Analyzed patient demographics, clinical data, and antibiotic use.
Main Results:
- 37% of 270 patients were colonized with P. aeruginosa (63 on admission, 37 acquired during ICU stay).
- Admission colonization was linked to prior hospitalization, age, gastrointestinal disease, and antibiotic use.
- Acquired strains showed diverse serotypes; cross-infection was infrequent (12 cases), with limited potential for prevention by isolation.
Conclusions:
- Endogenous gastrointestinal carriage may contribute significantly to apparent P. aeruginosa acquisitions.
- Traditional control measures targeting exogenous acquisition are unlikely to reduce overall infection incidence.
- Focusing on preventing infection in already colonized patients is essential for effective P. aeruginosa control in ICUs.