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Intravitreal Injection and Quantitation of Infection Parameters in a Mouse Model of Bacterial Endophthalmitis
07:24

Intravitreal Injection and Quantitation of Infection Parameters in a Mouse Model of Bacterial Endophthalmitis

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Nosocomial outbreak of Pseudomonas aeruginosa endophthalmitis

I Mateos1, R Valencia, M J Torres

  • 1Servicio de Microbiologia, Hospitales Universitarios Virgen del Rocio, Sevilla, Spain.

Infection Control and Hospital Epidemiology
|November 3, 2006
PubMed

Insights

A hospital outbreak of endophthalmitis was traced to contaminated trypan blue solution. Pseudomonas aeruginosa bacteria likely entered the sterile solution during preparation, causing serious eye infections in patients.

Area of Science:

  • Ophthalmology
  • Infectious Diseases
  • Microbiology

Background:

  • Nosocomial endophthalmitis poses a significant threat to vision following ocular procedures.
  • Identifying the source of infection is critical for outbreak control and prevention.

Purpose of the Study:

  • To investigate and identify the common source of a nosocomial endophthalmitis outbreak.
  • To determine the causative agent and transmission pathway of the infection.

Main Methods:

  • Clinical and microbiological data analysis to identify a temporal cluster of infections.
  • Investigating the hospital pharmacy's preparation of ophthalmic solutions.
  • Utilizing DNA fingerprinting for microbial source tracking.

Main Results:

  • A cluster of Pseudomonas aeruginosa endophthalmitis cases was identified.
  • The outbreak was linked to a common source: hospital-prepared trypan blue solution.
  • DNA fingerprinting confirmed the exogenous origin of the bacterial contamination.

Conclusions:

  • Contaminated trypan blue solution prepared in the hospital pharmacy was the source of the endophthalmitis outbreak.
  • Bacterial contamination likely occurred during the cooling phase after autoclaving the solution.
  • Strict protocols for sterile preparation and quality control of ophthalmic solutions are essential to prevent such outbreaks.

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