Fortified antibiotic ointment in bacterial keratitis

Area of Science:

• Ophthalmology
• Microbiology
• Pharmacology

Background:

• Pseudomonas keratitis is a severe bacterial eye infection.
• Antibiotic treatment is crucial for managing keratitis.
• Gentamicin is a common antibiotic used for bacterial infections.

Purpose of the Study:

• To evaluate the efficacy of fortified gentamicin ointment versus solution in treating Pseudomonas keratitis in rabbits.
• To assess the impact of different concentrations and treatment intervals of gentamicin on corneal bacterial counts.
• To determine if fortified gentamicin ointment can be effective at extended treatment intervals.

Main Methods:

• Experimental study involving rabbits with induced Pseudomonas keratitis.
• Administration of various concentrations of gentamicin ointment and solution, alongside a placebo.
• Evaluation of antimicrobial effect by measuring corneal bacterial colony counts at different time points.
• Comparison of treatment outcomes between different gentamicin formulations and administration schedules.

Main Results:

• Gentamicin solution (3 mg/ml) was superior to ointment (3 mg/g) in short-term trials for reducing bacterial counts.
• Fortified gentamicin ointment and solution showed comparable antimicrobial effects at 30-minute intervals.
• Fortified gentamicin ointment demonstrated efficacy in reducing bacterial counts even when administered at extended intervals (up to four hours) in a severe keratitis model.

Conclusions:

• Fortified gentamicin ointment is a viable and effective treatment for Pseudomonas keratitis.
• Extended treatment intervals for fortified gentamicin ointment are feasible and maintain antimicrobial activity.
• This study supports the use of fortified gentamicin ointment as a therapeutic option for bacterial keratitis, particularly when frequent administration is challenging.