Objectives: To update the local epidemiological data of Pseudomonas aeruginosa in intensive care units (ICU) by assessing the colonisation incidence rate and the level of cross-transmission.
Methods: Study carried out in both adult ICUs of the university-hospital of Besançon during a 2 years period. Clinical and surveillance specimens were screened for P. aeruginosa. Pulsed-field-gel-electrophoresis was used as genotyping method to evaluate the rate of cross-transmission.
Results: During the study, 314 patients were positive for P. aeruginosa (incidence rate of 19.1 patients per 100 admitted patients). One hundred sixty-six of these patients were detected with a clinical specimen and 148 with a screening specimen. Seventy-seven patients were colonised upon admission in the intensive care unit and 237, negative on admission, became positive during their stay. Of the ICU-acquired cases, the mean length of stay before P. aeruginosa colonisation was acquired was 15.7 days. Genotyping revealed that 53.5% of P. aeruginosa colonisation was acquired via cross-transmission (respectively 48.1% in the medical ICU and 59.2% in the surgical ICU); the other cases probably originated from endogenous sources.
Conclusion: The incidences of P. aeruginosa colonisation upon admission and during hospitalisation are consistent with other french and european studies. Although we probably over-estimated the rate of cross-transmission, our results demonstrate that cross-transmission may be a major cause of P. aeruginosa dissemination in ICUs.
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