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Clarithromycin for experimental Staphylococcus aureus keratitis.

E B Hume¹, J M Moreau, L L Conerly

¹Department of Microbiology, Immunology, and Parasitology, LSU Medical Center, New Orleans, LA 70112, USA.

Current Eye Research

|June 18, 1999

Summary

This summary is machine-generated.

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Clarithromycin effectively treated Staphylococcus aureus keratitis in rabbits, significantly reducing bacterial load. This macrolide antibiotic shows promise as an ocular medication for bacterial eye infections.

Area of Science:

Ophthalmology
Infectious Diseases
Microbiology

Background:

Bacterial keratitis is a significant cause of vision loss.
Staphylococcus aureus is a common pathogen in bacterial keratitis.
Limited antibiotic options exist for certain S. aureus strains.

Purpose of the Study:

To evaluate the efficacy of clarithromycin against Staphylococcus aureus keratitis.
To compare clarithromycin with erythromycin, minocycline, and tetracycline in a rabbit keratitis model.

Main Methods:

Rabbit eyes were infected with methicillin-sensitive or methicillin-resistant S. aureus strains.
Eyes were treated with topical antibiotics (clarithromycin, erythromycin, tetracycline, minocycline) or vehicle.
Bacterial load (CFU/cornea) was quantified at 10 hours postinfection.

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Main Results:

All antibiotic treatments significantly reduced bacterial CFU compared to controls.
Clarithromycin and erythromycin demonstrated superior efficacy, reducing CFU by approximately 5 logs (methicillin-sensitive) and 4 logs (methicillin-resistant).
Tetracycline and minocycline were also effective but less so than clarithromycin and erythromycin.

Conclusions:

Clarithromycin is an effective ocular treatment for experimental S. aureus keratitis.
Its efficacy in this model suggests a potential role for clarithromycin as a valuable ocular antibiotic.