Activities of micafungin against 315 invasive clinical isolates of fluconazole-resistant Candida spp

S A Messer; D J Diekema; L Boyken; S Tendolkar; R J Hollis; M A Pfaller

doi:10.1128/JCM.44.2.324-326.2006

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Activities of micafungin against 315 invasive clinical isolates of fluconazole-resistant Candida spp

Journal article

Open access

Peer reviewed

Activities of micafungin against 315 invasive clinical isolates of fluconazole-resistant Candida spp

S A Messer, D J Diekema, L Boyken, S Tendolkar, R J Hollis and M A Pfaller

Journal of clinical microbiology, Vol.44(2), pp.324-326

02/2006

DOI: 10.1128/JCM.44.2.324-326.2006

PMCID: PMC1392702

PMID: 16455878

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Abstract

Micafungin is a new echinocandin exhibiting broad-spectrum activity against Candida spp. The activity of the echinocandins against Candida species known to express intrinsic or acquired resistance to fluconazole is of interest. We determined the MICs of micafungin and caspofungin against 315 invasive clinical (bloodstream and other sterile-site) isolates of fluconazole-resistant Candida species obtained from geographically diverse medical centers between 2001 and 2004. MICs were determined using broth microdilution according to the CLSI reference method M27-A2. RPMI 1640 was used as the test medium, and we used the MIC endpoint of prominent growth reduction at 24 h. Among the 315 fluconazole-resistant Candida isolates, 146 (46%) were C. krusei, 110 (35%) were C. glabrata, 41 (13%) were C. albicans, and 18 (6%) were less frequently isolated species. Micafungin had good in vitro activity against all fluconazole-resistant Candida spp. tested; the MICs at which 50% (MIC(50)) and 90% (MIC(90)) of isolates were inhibited were 0.03 microg/ml and 0.06 microg/ml, respectively. All the fluconazole-resistant Candida spp. were inhibited at a micafungin MIC that was </=1 microg/ml. Among the most common fluconazole-resistant Candida spp. tested in the collection, C. glabrata exhibited the lowest micafungin MICs (MIC(90), </=0.015 microg/ml), followed by C. albicans (MIC(90), 0.03 microg/ml) and C. krusei (MIC(90), 0.06 microg/ml). The new echinocandin micafungin has excellent in vitro activity against 315 invasive clinical isolates of fluconazole-resistant Candida, which represents the largest collection to date of fluconazole-resistant Candida isolates tested against micafungin. Micafungin may prove useful in the treatment of infections due to azole-resistant Candida.

Antifungal Agents - pharmacology

Fluconazole - pharmacology

Humans

Peptides, Cyclic - pharmacology

Candidiasis - microbiology

Candida - isolation & purification

Microbial Sensitivity Tests

Candida - classification

Lipoproteins - pharmacology

Echinocandins

Candida - drug effects

Drug Resistance, Fungal

Lipopeptides

Details

Title: Subtitle: Activities of micafungin against 315 invasive clinical isolates of fluconazole-resistant Candida spp
Creators: S A Messer - Medical Microbiology Division, C606 GH, Department of Pathology, University of Iowa College of Medicine, Iowa City, IA 52242, USA
D J Diekema
L Boyken
S Tendolkar
R J Hollis
M A Pfaller
Resource Type: Journal article
Publication Details: Journal of clinical microbiology, Vol.44(2), pp.324-326
DOI: 10.1128/JCM.44.2.324-326.2006
PMID: 16455878
PMCID: PMC1392702
NLM abbreviation: J Clin Microbiol
ISSN: 0095-1137
eISSN: 1098-660X
Publisher: United States
Language: English
Date published: 02/2006
Academic Unit: Infectious Diseases; Epidemiology; Pathology; Internal Medicine
Record Identifier: 9983986366802771

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