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[Cluster of Pseudomonas aeruginosa in a neurosurgical unit]

I Torre1, F P Sferratore, M Crispino

  • 1Dipartimento di Scienze Mediche Preventive, Facoltà di Medicina e Chirurgia, Università degli Studi di Napoli "Federico II". itorre@unina.it

Annali Di Igiene : Medicina Preventiva E Di Comunita
|November 24, 2004
PubMed

Insights

Pseudomonas aeruginosa hospital infections, including meningitis, are common in neurosurgical units. Molecular typing identified an environmental source linked to patient infections, highlighting the need for broader surveillance.

Area of Science:

  • Medical Microbiology
  • Infectious Diseases
  • Hospital Epidemiology

Background:

  • Hospital-acquired infections (HAIs) pose significant risks, particularly in vulnerable patient populations.
  • Pseudomonas aeruginosa is a common opportunistic pathogen implicated in HAIs, especially in neurosurgical settings.
  • Meningitis and surgical site infections are critical concerns in neurosurgery wards.

Purpose of the Study:

  • To investigate the source and molecular characteristics of Pseudomonas aeruginosa infections in a neurosurgical ward.
  • To determine the clonal relationship between clinical isolates and potential environmental reservoirs.
  • To assess the utility of molecular typing in hospital infection surveillance.

Main Methods:

  • Genotypic typing of Pseudomonas aeruginosa isolates using Pulsed Field Gel Electrophoresis (PFGE) after XbaI digestion.
  • Analysis of macrorestriction patterns of genomic DNA.
  • Comparison of clinical isolates with environmental isolates from the ward.

Main Results:

  • Five cases of Pseudomonas aeruginosa infection (3 meningitis, 2 surgical site infections) were identified.
  • An identical PFGE pattern was observed between four clinical isolates and one environmental isolate from a hand washing basin.
  • The linked isolates shared a multiresistant antibiotype, suggesting a common source.
  • The environmental isolate originated from the sub-intensive care area.

Conclusions:

  • Environmental contamination can be a significant source of Pseudomonas aeruginosa infections in neurosurgical wards.
  • Molecular typing, such as PFGE, is crucial for identifying outbreak sources and guiding infection control.
  • Hospital infection surveillance programs should incorporate molecular typing of both clinical and environmental isolates.
  • Identifying environmental reservoirs and hospital staff strains is vital during outbreaks.

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