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Quantification, Viability Assessment, and Visualization Strategies for Acinetobacter Biofilms
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Polyclonal endemicity of Acinetobacter baumannii in ventilated patients in an intensive care unit in Uruguay

Julio Cesar Medina-Presentado1, Verónica Seija, Rafael Vignoli

  • 1Cátedra de Enfermedades Infecciosas, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Av. Alfredo Navarro 3051, Montevideo, 11600, Uruguay. jcmedina@fmed.edu.uy

International Journal of Infectious Diseases : IJID : Official Publication of the International Society for Infectious Diseases
|February 19, 2013
PubMed
Abstract

Insights

Digestive colonization by Acinetobacter baumannii is a significant risk factor for respiratory infections in intubated patients. Most cases of ventilator-associated pneumonia (VAP) stem from exogenous sources, often following prior colonization.

Area of Science:

  • Medical Microbiology
  • Infectious Diseases
  • Critical Care Medicine

Background:

  • Acinetobacter baumannii is a significant cause of hospital-acquired infections, particularly in intensive care units (ICUs).
  • Intubated patients are at high risk for respiratory infections, including ventilator-associated pneumonia (VAP).
  • Understanding the transmission and colonization patterns of A. baumannii is crucial for infection control.

Purpose of the Study:

  • To elucidate the mechanisms of Acinetobacter baumannii respiratory infections in intubated patients.
  • To identify risk factors associated with digestive colonization and subsequent infection by A. baumannii.
  • To differentiate between endogenous and exogenous sources of A. baumannii VAP.

Main Methods:

  • A prospective study was conducted in an ICU involving 175 intubated patients.
  • Pharyngeal, rectal, and respiratory samples were collected at multiple time points.
  • Enterobacterial repetitive intergenic consensus (ERIC)-PCR was used to compare A. baumannii isolates.

Main Results:

  • A. baumannii digestive colonization was detected in 62 patients.
  • Twenty cases of lower respiratory tract infections occurred, including 14 VAP and six purulent tracheobronchitis (PTB).
  • Digestive colonization was an independent risk factor for lower respiratory tract infections (RR 8.71, p<0.0001).

Conclusions:

  • The pathogenesis of A. baumannii VAP in this ICU setting is mixed.
  • The majority of VAP cases resulted from exogenous pneumonia following prior colonization.
  • Digestive colonization serves as a critical precursor to respiratory infections by A. baumannii.

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