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  • Title: Safety and efficacy of intrastromal injection of 5% natamycin in experimental fusarium keratitis.
    Author: Mimouni M, Tam G, Paitan Y, Kidron D, Segev F.
    Journal: J Ocul Pharmacol Ther; 2014 Sep; 30(7):543-7. PubMed ID: 24919100.
    Abstract:
    PURPOSE: To compare the efficacy of combined intrastromal injection and topical natamycin 5% to standard topical therapy alone in an experimental rabbit model of Fusarium keratitis. METHODS: Fungal keratitis was induced in the right eyes of 12 New Zealand rabbits by stromal injection of Fusarium solani spore suspension into the cornea. Four days after inoculation, animals were randomly assigned to 2 different treatment groups (n=6 in each group). The study group received intrastromal injections of natamycin 5% on treatment day 1 and 4, combined with topical natamycin 5% eye drops given hourly between 8:00 and 20:00 for the first 2 days, followed by 4 times daily on days 3-11. The control group received only topical natamycin 5% at identical intervals. Eyes were examined clinically on days 1, 4, 7, and 11 for status of corneal healing, corneal vascularization, and hypopyon. Animals were sacrificed on day 11, and corneas were subjected to histopathological examination. RESULTS: Both groups showed significant improvement in terms of conjunctival hyperemia, size and density of corneal infiltrate, corneal edema, and total clinical score. In the study group, there was a significant improvement in the height of hypopyon in the anterior chamber, while there was also an increased amount of vascularization. CONCLUSIONS: This study showed that intrastromal injection of natamycin 5% combined with topical treatment has little beneficial effect over topical therapy in a Fusarium keratitis rabbit model. The addition of intrastromal injection should be reserved to the most severe or recalcitrant cases.
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