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Controlling the clonal spread of Pseudomonas aeruginosa infection

Graziella H Pereira1, Anna S Levin, Helenice Bosco Oliveira

  • 1Institute of Infectious Diseases Emilio Ribas, Faculdade de Medicina, University of São Paulo, Brazil. ghpereira1@terra.com.br

Infection Control and Hospital Epidemiology
|May 15, 2008
PubMed

Insights

Extended hospitalization increases the risk of nosocomial infections from imipenem-resistant Pseudomonas aeruginosa. A single clone dominated resistant and susceptible strains, with interventions reducing overall P. aeruginosa infections.

Area of Science:

  • Infectious Diseases
  • Microbiology
  • Hospital Epidemiology

Background:

  • Nosocomial infections pose a significant threat in healthcare settings.
  • Pseudomonas aeruginosa is a common cause of hospital-acquired infections.
  • Antimicrobial resistance, particularly to carbapenems like imipenem, is a growing concern.

Purpose of the Study:

  • To investigate factors associated with nosocomial infections caused by imipenem-resistant and imipenem-susceptible Pseudomonas aeruginosa.
  • To determine the clonal relatedness of resistant and susceptible P. aeruginosa isolates.
  • To evaluate the impact of an intervention on P. aeruginosa infections.

Main Methods:

  • A case-control study design was employed.
  • Genotyping techniques were utilized to analyze bacterial isolates.
  • Data on patient hospitalization duration and infection status were collected.

Main Results:

  • Prolonged hospitalization (over 15 days) was independently linked to imipenem-resistant P. aeruginosa infections.
  • A single dominant clone accounted for 67% of imipenem-resistant isolates and 23% of imipenem-susceptible isolates.
  • A subsequent intervention resulted in a reduction of both imipenem-resistant and imipenem-susceptible P. aeruginosa infections.

Conclusions:

  • Extended hospitalization is a key risk factor for imipenem-resistant P. aeruginosa.
  • Clonal spread plays a significant role in the epidemiology of P. aeruginosa in hospitals.
  • Effective interventions can successfully decrease the incidence of P. aeruginosa nosocomial infections.

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