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Journal of Clinical Microbiology, November 2004, p. 4977-4979, Vol. 42, No. 11
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.11.4977-4979.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Evaluation of the Etest Method Using Mueller-Hinton Agar with Glucose and Methylene Blue for Determining Amphotericin B MICs for 4,936 Clinical Isolates of Candida Species

M. A. Pfaller,1,2* L. Boyken,1 S. A. Messer,1 S. Tendolkar,1 R. J. Hollis,1 and D. J. Diekema1,3

Departments of Pathology,1 Medicine, Roy J. and Lucille A. Carver College of Medicine,3 Department of Epidemiology, College of Public Health, University of Iowa, Iowa City, Iowa2

Received 27 February 2004/ Returned for modification 10 April 2004/ Accepted 20 April 2004

The performance of the Etest using Mueller-Hinton agar supplemented with glucose (2%) and methylene blue (0.5 µg/ml) (MH-GMB) for amphotericin B susceptibility testing of 4,936 isolates of Candida spp. was assessed against that of Etest using RPMI agar with 2% glucose (RPG). MICs were determined by Etest in both media for all 4,936 isolates and were read after incubation for 48 h at 35°C. The Candida isolates included C. albicans (n = 2,728), C. glabrata (n = 722), C. parapsilosis (n = 666), C. tropicalis (n = 528), C. krusei (n = 143), C. lusitaniae (n = 54), C. guilliermondii (n = 39), C. pelliculosa (n = 17), C. kefyr (n = 15), C. rugosa (n = 11), C. dubliniensis (n = 5), C. zeylanoides (n = 4), C. lipolytica (n = 3), and C. famata (n = 1). The Etest results with MH-GMB correlated well with those with RPG. Overall agreement was 92.9%, and agreements for individual species were as follows: C. lusitaniae, 98.1%; C. albicans, 95.1%; C. glabrata, 94.3%; C. krusei, 91.6%; C. parapsilosis, 86.6%; and C. tropicalis, 86.4%. The Etest method using MH-GMB appears to be a useful method for determining amphotericin B susceptibilities of Candida species.

* Corresponding author. Mailing address: Medical Microbiology Division, C606 GH, Department of Pathology, University of Iowa College of Medicine, Iowa City, IA 52242. Phone: (319) 384-9566. Fax: (319) 356-4916. E-mail: michael-pfaller{at}uiowa.edu.

Journal of Clinical Microbiology, November 2004, p. 4977-4979, Vol. 42, No. 11
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.11.4977-4979.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Pfaller, M. A., Diekema, D. J., Gibbs, D. L., Newell, V. A., Nagy, E., Dobiasova, S., Rinaldi, M., Barton, R., Veselov, A., the Global Antifungal Surveillance Group, (2008). Candida krusei, a Multidrug-Resistant Opportunistic Fungal Pathogen: Geographic and Temporal Trends from the ARTEMIS DISK Antifungal Surveillance Program, 2001 to 2005. J. Clin. Microbiol. 46: 515-521 [Abstract] [Full Text]  
  • Pfaller, M. A., Diekema, D. J., Procop, G. W., Rinaldi, M. G. (2007). Multicenter Comparison of the VITEK 2 Antifungal Susceptibility Test with the CLSI Broth Microdilution Reference Method for Testing Amphotericin B, Flucytosine, and Voriconazole against Candida spp.. J. Clin. Microbiol. 45: 3522-3528 [Abstract] [Full Text]  
  • Pfaller, M. A., Diekema, D. J. (2007). Epidemiology of Invasive Candidiasis: a Persistent Public Health Problem. Clin. Microbiol. Rev. 20: 133-163 [Abstract] [Full Text]  


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