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Updated: May 10, 2026

Tools for the Real-Time Assessment of a Pseudomonas aeruginosa Infection Model
Published on: April 6, 2021
Infectious conjunctivitis caused by Pseudomonas aeruginosa isolated from a bathroom
Background:
The elucidation of the routes of transmission of a pathogen is crucial for the prevention of infectious diseases caused by bacteria that are not a resident in human tissue. The purpose of this report is to describe a case of suture-related conjunctivitis caused by Pseudomonas aeruginosa for which we identified the transmission route using pulsed-field gel electrophoresis (PFGE).
Case Presentation:
A 38-year-old man, who had undergone surgery for glaucoma 2 years ago previously, presented with redness, discomfort, and mucopurulent discharge in the right eye. A 9-0 silk suture had been left on the conjunctiva. A strain of P. aeruginosa was isolated from a culture obtained from the suture, and the patient was therefore diagnosed with suture-related conjunctivitis caused by P. aeruginosa. The conjunctivitis was cured by the application of an antimicrobial ophthalmic solution and removal of the suture. We used PFGE to survey of the indoor and outdoor environments around the patient's house and office in order to elucidate the route of transmission of the infection. Three strains of P. aeruginosa were isolated from the patient's indoor environment, and the isolate obtained from the patient's bathroom was identical to that from the suture.
Conclusion:
The case highlights the fact that an indoor environmental strain of P. aeruginosa can cause ocular infections.
Insights
Pseudomonas aeruginosa from an indoor environment caused suture-related conjunctivitis in a patient. Pulsed-field gel electrophoresis (PFGE) identified the bathroom as the infection source, highlighting environmental risks.
Area of Science:
- Ophthalmology
- Infectious Diseases
- Microbiology
Background:
- Identifying pathogen transmission routes is vital for preventing non-resident bacterial infections.
- This report details a case of suture-related conjunctivitis caused by Pseudomonas aeruginosa.
- Pulsed-field gel electrophoresis (PFGE) was employed to trace the infection's transmission pathway.
Observation:
- A 38-year-old man presented with right eye redness, discomfort, and mucopurulent discharge.
- A residual silk suture on the conjunctiva yielded P. aeruginosa upon culture.
- The patient was diagnosed with suture-related conjunctivitis, successfully treated with antibiotics and suture removal.
Findings:
- PFGE analysis of environmental samples identified P. aeruginosa strains.
- Three P. aeruginosa strains were isolated from the patient's indoor environment.
- An environmental isolate from the patient's bathroom matched the strain from the conjunctival suture.
Implications:
- This case demonstrates that indoor environmental strains of P. aeruginosa can lead to ocular infections.
- Environmental hygiene is critical in preventing opportunistic bacterial infections, especially in post-surgical patients.
- PFGE is a valuable tool for elucidating infectious disease transmission routes in clinical settings.
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