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Risk factors for nosocomial colonization with multiresistant Acinetobacter baumannii
1Laboratoire de Bactériologie-Hygiène, Faculté de Médecine, Hôpital Jean Minjoz, Besançon, France.
Summary
Acinetobacter baumannii cross-contamination is common in hospitals, especially in intensive care units. Colonized patients and broad-spectrum antibiotic use are key factors driving its spread.
Area of Science:
- Infectious Diseases
- Clinical Microbiology
- Hospital Epidemiology
Background:
- Acinetobacter baumannii is a significant nosocomial pathogen.
- Understanding its transmission dynamics is crucial for infection control.
Purpose of the Study:
- To determine the incidence of Acinetobacter baumannii cross-contamination in a university hospital.
- To identify risk factors associated with Acinetobacter baumannii colonization.
Main Methods:
- Prospective survey over six months.
- Biotyping and genotyping (pulsed-field gel electrophoresis) of clinical isolates.
- Case-control univariate and multivariate analyses for risk factor identification.
Main Results:
- 147 patients were colonized or infected; 52 in ICUs.
- Urinary and bronchopulmonary tracts were most frequently colonized.
- Epidemic multi-resistant strains were identified in 65 patients.
- Risk factors included male gender, prior hospitalization, longer stays, hyperalimentation, third-generation cephalosporins, and urinary catheters.
Conclusions:
- Frequent cross-contamination and broad-spectrum antibiotic use contribute to high Acinetobacter baumannii colonization rates.
- Colonized patients serve as the primary source for hospital-wide strain dissemination.