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Pseudomonas aeruginosa clonal dissemination in Brazilian intensive care units

Caio Marcio Figueiredo-Mendes1, Sumiko Sinto, Jorge Luiz Mello-Sampaio

  • 1Fleury Institute, São Paulo, Brazil.

Enfermedades Infecciosas Y Microbiologia Clinica
|September 15, 2005
PubMed
Abstract

Insights

Multidrug-resistant Pseudomonas aeruginosa clones spread within and between Brazilian intensive care units. This clonal dissemination impacts surveillance data and susceptibility rates, highlighting the need for effective control strategies.

Area of Science:

  • Infectious Diseases
  • Microbiology
  • Public Health

Background:

  • Nosocomial infections pose a significant threat in healthcare settings.
  • Multidrug-resistant (MDR) bacteria, such as Pseudomonas aeruginosa, are a growing concern.
  • Effective surveillance is crucial for controlling the spread of resistant pathogens.

Purpose of the Study:

  • To investigate the clonal dissemination of multidrug-resistant Pseudomonas aeruginosa isolates.
  • To analyze the spread of these resistant strains within and between intensive care units (ICUs) in Brazil.
  • To understand the implications of clonal spread on antimicrobial susceptibility surveillance.

Main Methods:

  • Pulsed-field gel electrophoresis (PFGE) was used to analyze chromosomal DNA.
  • Thirty-six MDR Pseudomonas aeruginosa isolates were collected from ICUs in Brazil in 2002.
  • Isolates were resistant to meropenem or imipenem plus at least two other antibiotics.

Main Results:

  • Five major clones (A, B, C, D, G) of multidrug-resistant Pseudomonas aeruginosa were identified.
  • Clone A showed dissemination across two centers, while other clones were predominantly found within single centers.
  • Eight isolates were unique, and isolates from one center were all unique.

Conclusions:

  • Clonal dissemination of multidrug-resistant Pseudomonas aeruginosa was confirmed within and between ICUs.
  • The spread of specific resistant clones can significantly influence observed antimicrobial susceptibility rates.
  • These findings underscore the importance of molecular typing for effective infection control and surveillance.

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