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  • Title: 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.
    Author: Pfaller MA, Boyken L, Messer SA, Tendolkar S, Hollis RJ, Diekema DJ.
    Journal: J Clin Microbiol; 2004 Nov; 42(11):4977-9. PubMed ID: 15528683.
    Abstract:
    The performance of the Etest using Mueller-Hinton agar supplemented with glucose (2%) and methylene blue (0.5 microg/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 degrees 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.
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