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Journal of Clinical Microbiology, October 1998, p. 2950-2956, Vol. 36, No. 10
Division of Infectious Diseases, Medical
College of Virginia, Virginia Commonwealth University, Richmond,
Virginia 23298-0049
Received 9 April 1998/Returned for modification 5 June
1998/Accepted 23 June 1998
The in vitro antifungal activities of SCH56592, MK-0991, and
LY303366 against 83 isolates of Acremonium strictum,
Aspergillus flavus, Aspergillus fumigatus,
Aspergillus terreus, Bipolaris spp.,
Blastomyces dermatitidis, Cladophialophora
bantiana, Fusarium oxysporum, Fusarium
solani, Histoplasma capsulatum,
Phialophora spp., Pseudallescheria boydii,
Rhizopus arrhizus, Scedosporium prolificans,
and Sporothrix schenckii were compared. The in vitro activities of these agents against 104 isolates of yeast pathogens of
Candida spp., Cryptococcus neoformans, and
Trichosporon beigelii were also compared. MICs were
determined by following a procedure under evaluation by the National
Committee for Clinical Laboratory Standards (NCCLS) for broth
microdilution testing of the filamentous fungi (visual MICs) and the
NCCLS M27-A broth microdilution method for yeasts (both visual and
turbidimetric MICs). The in vitro fungicidal activity of SCH56592 was
superior (minimum fungicidal concentrations [MFCs], 0.25 to
4 µg/ml for 7 of 18 species tested) to those of MK-0991 and LY303366
(MFCs, 8 to >16 µg/ml for all species tested) for the molds
tested, but the echinocandins had a broader spectrum of
fungicidal activity (MFCs at which 90% of strains are
inhibited [MFC90s], 0.5 to 4 µg/ml for 6 of 9 species tested) than SCH56592 (MFC90s, 0.25 to 8 µg/ml for 4 of 9 species tested) against most of the yeasts tested. Neither echinocandin had in vitro activity (MICs, >16 µg/ml) against C. neoformans and T. beigelii, while the SCH56592
MICs ranged from 0.12 to 1.0 µg/ml for these two species. The MICs of
the three agents for the other species ranged from <0.03 to 4 µg/ml.
These results suggest that these new agents have broad-spectrum
activities in vitro; their effectiveness in the treatment of human
mycoses is to be determined.
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Comparison of In Vitro Activities of the New Triazole SCH56592
and the Echinocandins MK-0991 (L-743,872) and LY303366 against
Opportunistic Filamentous and Dimorphic Fungi and Yeasts
*
Mailing address: Medical College of Virginia of
Virginia Commonwealth University, P.O. Box 980049, Richmond, VA
23298-0049. Phone: (804) 828-9711. Fax: (804) 828-3097.
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