Comparative antifungal susceptibility analysis of Candida albicans versus non-albicans Candida corneal isolates

Oriel Spierer, Jyoti Dugar, Darlene Miller, Terrence P. O'Brien*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Purpose: To compare the in vitro activity of topical amphotericin B (AMB), natamycin, voriconazole, and fluconazole against human corneal isolates of Candida sp. for guidance in the treatment of Candida keratitis. Methods: Sixty-eight Candida isolates (37 albicans and 31 nonalbicans isolates) recovered from corneal scrapings submitted to rule out microbial keratitis, during the years 2005 to 2011, at the Bascom Palmer Eye Institute, were examined in this study. Corneal isolates were cultured on fungal agars for 48 hours. Each yeast isolate was dispensed into 4 microtiter wells, each containing 100 mL of commercial (natamycin 5%) or compounded (AMB 0.15%, voriconazole 1%, and fluconazole 0.2%) antifungal medications. A comparison of growth patterns was conducted. Results: One hundred percent of the samples showed growth inhibition after treatment exposure with AMB or natamycin. The isolates treated with voriconazole demonstrated an 85% inhibition rate overall, with the Candida albicans samples showing a 77% inhibition rate and the non-albicans sp. a 93% inhibition rate. In the fluconazole group, there was only a 19.6% inhibition rate noted, with a 7.7% inhibition rate observed in the C. albicans group versus a 30% inhibition rate in the non-albicans group. Conclusions: AMB 0.2% and natamycin 5% have equal effectiveness and full inhibition against Candida keratitis isolates. Fluconazole 0.2% is not the drug of choice in both C. albicans and non-albicans keratitis. Voriconazole 1% may need a stronger concentration for higher effectiveness, but potentially may be helpful as a second agent in the treatment of Candida keratitis.

Original languageEnglish
Pages (from-to)576-579
Number of pages4
JournalCornea
Volume34
Issue number5
DOIs
StatePublished - 2 Mar 2015
Externally publishedYes

Funding

FundersFunder number
National Eye InstituteP30EY014801

    Keywords

    • Candida albicans
    • amphotericin B
    • fluconazole
    • infectious keratitis
    • natamycin
    • non-albicans Candida
    • voriconazole

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