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Journal of Antimicrobial Chemotherapy, Vol 39, 591-596, Copyright © 1997 by The British Society for Antimicrobial Chemotherapy

JOURNAL ARTICLE

In-vitro susceptibility pattern of Candida lusitaniae and evaluation of the Etest method

A Favel, A Michel-Nguyen, C Chastin, F Trousson, A Penaud and P Regli
Laboratoire de Botanique, Cryptogamie et Biologie Cellulaire, Faculte de Pharmacie, Marseille, France.

The antifungal susceptibility of 35 Candida lusitaniae isolates was determined in vitro by the National Committee for Clinical Laboratory Standards (NCCLS) M27-P macrodilution methodology. All the isolates were susceptible to ketoconazole, itraconazole and fluconazole. Of the 35 isolates, eight (23%) were resistant to flucytosine. For amphotericin B, M27-P yielded a narrow range of MICs (0.06-0.5 mg/L). We therefore investigated the activity of this drug by reading MICs at 72 h and by using alternative media, namely casitone complex medium (CCM) and antibiotic medium 3 (M-3). Reading at 72 h did not generate reproducible results. CCM and M-3 provided better discrimination between the isolates but did not change the rank order of the MICs. We thus concluded that all the isolates were susceptible to amphotericin B. We also conducted an evaluation with the Etest method according to the manufacturer's instructions with RPMI 1640 agar, CCM and the alternative semi-synthetic medium (SSM). For RPMI 1640, agreements +/-2 dilutions were 58% for amphotericin B, 92% for flucytosine, 57% for ketoconazole, 92% for fluconazole and 74% for itraconazole. CCM did not improve the agreement rates between the two methods but it led to better growth of all the isolates. The suitability of SSM was pointed out with itraconazole. The poor agreement rates for amphotericin B and ketoconazole call for further evaluation of the Etest method to assess several drug-organism combinations.
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