Abstract

YOMAYUSA, Nancy et al. Characterization of an outbreak infection caused by Acinetobacter baumannii in an intensive care unit, in Bogotá, Colombia. Infect. [online]. 2008, vol.12, n.1, pp.11-20. ISSN 0123-9392.

Objective: Epidemiological and molecular characterization of an outbreak infection caused byAcinetobacter baumannii and the determination of the associated factors. Design: Case-control study nested in a cohort of patients hospitalized in the intensive care unit (ICU) between October 2003 and March 2004. Inclusion criteria: patients that had been hospitalized in the ICU during the same period of time and patients who underwent an invasive procedure. Patients who died during the first 24 hours of admission to the ICU or those submitted or referred from another institution were excluded. Age, gender, past medical history of chronic disease, therapeutic index score system (TISS), time of use of invasive devices, type of nutrition support, previous exposure to antibiotics, surgical procedure, time of exposition and length of stay at the ICU were assessed. The epidemiological research of the isolates included molecular typification through pulse-field gel electrophoresis. Results: The isolates of A. baumannii obtained from infected patients and those from the surveillance cultures were resistant to multiple antibiotics. The isolates were found to be genetically related, with a similarity percentage of more than 97%. A significant statistic relationship was found between infections by A. baumannii, with a higher therapeutic intervention score system during the ICU hospitalization (p=0.030), parenteral nutrition support (p=0.030), and exposure duration (p=0.02). Conclusions: Infection by A. baumannii was associated to a higher therapeutic intervention score system, parenteral nutrition support (p=0.030), and exposition duration (p=0.02). A. baumannii isolates were found to be genetically related.

Keywords : Acinetobacter baumannii; resistance; risks factors; parenteral nutrition support; case and control study.

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