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Journal of Clinical Microbiology, July 2001, p. 2738-2741, Vol. 39, No. 7
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.7.2738-2741.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Utility of 2,3-Bis(2-Methoxy-4-Nitro-5-Sulfophenyl)-5-[(Phenyl-Amino)Carbonyl]-2H-Tetrazolium Hydroxide (XTT) and Minimum Effective Concentration Assays in the Determination of Antifungal Susceptibility of Aspergillus fumigatus to the Lipopeptide Class of Compounds

S. P. Hawser,1 C. Jessup,2 J. Vitullo,2 and M. A. Ghannoum2,3,*

Aventis, F-93235 Romainville, France,1 and Mycology Reference Laboratory, Center for Medical Mycology, University Hospitals of Cleveland,3 and Department of Dermatology, Case Western Reserve University,2 Cleveland, Ohio 44106-5028

Received 1 September 2000/Returned for modification 9 February 2001/Accepted 19 April 2001

The susceptibility of Aspergillus fumigatus to mulundocandin, an echinocandin-like compound, and other antifungal agents was assessed by the National Committee for Clinical Laboratory Standards (NCCLS) M38-P method, a 2,3-bis(2-methoxy-4-nitro-5-sulfophenyl)-5-[(phenyl-amino)carbonyl]-2H-tetrazolium hydroxide (XTT)-based colorimetric assay, and determination of morphologic alterations by microscopy. In contrast to the NCCLS M38-P method, which does not predict the activity in vivo, the XTT-based assay showed that A. fumigatus is susceptible to mulundocandin. Thus, the XTT-based assay might be useful for determination of the susceptibilities of molds to echinocandins. Further evaluation is warranted.


* Corresponding author. Mailing address: Mycology Reference Laboratory, Center for Medical Mycology, University Hospitals of Cleveland, 11100 Euclid Ave., LKS 5028, Cleveland, OH 44106-5028. Phone: (216) 844-8580. Fax: (216) 844-1076. E-mail: mag3{at}po.cwru.edu.


Journal of Clinical Microbiology, July 2001, p. 2738-2741, Vol. 39, No. 7
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.7.2738-2741.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.



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