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In vitro susceptibility of filamentous fungal isolates from a corneal ulcer clinical trial.

Abstract：

PURPOSE:To describe the minimum inhibitory concentration (MIC) of fungal isolates to natamycin and voriconazole, and to compare these MICs to previous ocular susceptibility studies. DESIGN:Experimental laboratory study using isolates from a randomized clinical trial. METHODS:The Mycotic Ulcer Treatment Trial I was a randomized, double-masked, multicenter trial comparing topical natamycin and voriconazole for fungal keratitis treatment. Susceptibility testing to natamycin and voriconazole were performed according to Clinical and Laboratory Standards Institute methods. The relationship between organism and MIC was assessed. A literature review was performed to compare results to previous ocular susceptibility studies. RESULTS:Of the 323 patients enrolled in the trial, MICs were available for 221 (68%). Fusarium (n = 126) and Aspergillus species (n = 52) were the most commonly isolated organisms. MICs to natamycin and voriconazole were significantly different across all genera (P < .001). The MIC median (MIC50) and 90th percentile (MIC90) for natamycin were equal to or higher than voriconazole for all organisms except Curvularia species. Compared to other organisms, Fusarium species isolates had the highest MICs to voriconazole and Aspergillus flavus isolates had the highest MICs to natamycin. Our results were similar to previous reports except that the voriconazole MIC90 against Aspergillus species was 2-fold higher and the natamycin MIC90 against Aspergillus fumigatus was 4-fold higher in our study. CONCLUSION:In this large susceptibility study, Fusarium isolates were least susceptible to voriconazole and A flavus isolates were least susceptible to natamycin when compared to other filamentous fungi. In the future, susceptibility testing may help guide therapy if performed in a timely manner.

journal_name

Am J Ophthalmol

journal_title

American journal of ophthalmology

authors

Lalitha P,Sun CQ,Prajna NV,Karpagam R,Geetha M,O'Brien KS,Cevallos V,McLeod SD,Acharya NR,Lietman TM,Mycotic Ulcer Treatment Trial Group.

doi

10.1016/j.ajo.2013.10.004

subject

Has Abstract

pub_date

2014-02-01 00:00:00

pages

318-26

issue

eissn

0002-9394

issn

1879-1891

pii

S0002-9394(13)00685-5

journal_volume

157

pub_type

杂志文章,多中心研究,随机对照试验

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In vitro susceptibility of filamentous fungal isolates from a corneal ulcer clinical trial.