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Spontaneous sterilization in experimental Staphylococcus epidermidis endophthalmitis
T A Meredith1, A Trabelsi, M J Miller
1Emory University School of Medicine, Department of Ophthalmology, Atlanta, Georgia 30322.
Abstract:
We created a standardized model of endophthalmitis in the aphakic rabbit eye using a laboratory strain of Staphylococcus epidermidis of known characteristics (ATCC 155). Eyes were injected with the following number of organisms: 170, 3760, 8750, 170,000 and 460,000. Serial quantitative cultures, clinical grading of infection and histopathologic studies were performed on days 1, 2, 3, 7 and 14. Bacteria appeared to multiply rapidly during the first 24 hr with peak recovery at 8 to 24 hr. Fewer bacteria were cultured on the third day after injection, and positive cultures were rare after the third day. Inflammatory scores were initially higher with each increased number of injected bacteria and tended to increase for the first 3 to 5 days.
Insights
This study established a rabbit eye model for endophthalmitis using Staphylococcus epidermidis. Bacterial levels peaked within 24 hours, with inflammation correlating to initial bacterial load.
Area of Science:
- Ophthalmology
- Microbiology
- Veterinary Medicine
Background:
- Endophthalmitis is a severe intraocular inflammation.
- Standardized models are crucial for studying infection dynamics and treatment efficacy.
Purpose of the Study:
- To develop and characterize a standardized rabbit eye model for endophthalmitis.
- To investigate the early bacterial growth and inflammatory response in experimental endophthalmitis.
Main Methods:
- A standardized model of endophthalmitis was created in aphakic rabbit eyes.
- Inoculation with varying concentrations of Staphylococcus epidermidis (ATCC 155).
- Serial quantitative cultures, clinical grading, and histopathologic studies were conducted.
Main Results:
- Staphylococcus epidermidis rapidly multiplied within the first 24 hours, with peak recovery between 8-24 hours.
- Bacterial counts decreased significantly by day 3, with rare positive cultures thereafter.
- Inflammatory scores correlated positively with the initial bacterial inoculum and increased over the first 3-5 days.
Conclusions:
- The developed rabbit eye model effectively replicates key features of bacterial endophthalmitis.
- Early bacterial proliferation and subsequent host inflammatory response are characteristic of this model.
- This model provides a reliable platform for evaluating anti-endophthalmitis therapies.