title: Species level identification and antifungal susceptibility of yeasts isolated from various clinical specimens and evaluation of Integral System Yeasts Plus.
abstract: It is essential to use easy, standard, cost-effective and accurate methods for identification and susceptibility testing of yeasts in routine practice. This study aimed to establish the species distribution and antifungal susceptibility of yeast isolates and also to evaluate the performance of the colorimetric and commercially available Integral System Yeasts Plus (ISYP). Yeast isolates (n=116) were identified by conventional methods and ISYP. Antifungal susceptibility testing was performed by the microdilution method according to the standards of CLSI M27-A3 and ISYP. Candida albicans (50%) was the most common species isolated, followed by C. parapsilosis (25%) (mostly in blood samples). According to the CLSI M27-S3 criteria, resistance rates for amphotericin B, flucytosine, fluconazole, itraconazole, and voriconazole were 0%, 0%, 4.6%, 4.5% and 1.8%, respectively. Resistance for miconazole (MIC >1 mg/L) was found as 17.9%. Sixty-two (53.4%) of the isolates which were analyzed by ISYP showed disagreement with those identified by the conventional methods and API ID 32C identification kit or a specific identification code could not be assigned by ISYP. The performance of ISYP could be indicated as low for all antifungal drugs tested according to the ROC analysis (AUC: 0.28-0.56). As the current version of ISYP displays a poor performance, it is recommended to use the other commercial systems whose results are approved as reliable and in agreement with those of the reference methods in identification and susceptibility testing of yeasts.
authors: Dr. Suat Seren Training and Research Hospital for Chest Diseases and Chest Surgery, Yenisehir, Izmir, Turkey. cbicmen@yahoo.com
authors: Can
authors: C
authors: Bicmen
authors: Mine
authors: M
authors: Doluca
authors: Sinem
authors: S
authors: Gulat
authors: Ayriz T
authors: AT
authors: Gunduz
authors: Fevziye
authors: F
authors: Tuksavul
mesh_terms: D000666:Amphotericin B / Q000494:pharmacology; D002175:Candida / Q000145:classification / Q000187:drug effects / Q000302:isolation & purification*; D003124:Colorimetry / Q000379:methods*; D026141:Drug Resistance, Multiple, Fungal; D015725:Fluconazole / Q000494:pharmacology; D005437:Flucytosine / Q000494:pharmacology; D006801:Humans; D017964:Itraconazole / Q000494:pharmacology; D008826:Microbial Sensitivity Tests / Q000379:methods* / Q000592:standards; D011743:Pyrimidines / Q000494:pharmacology; D012372:ROC Curve; D011933:Reagent Kits, Diagnostic / Q000592:standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014230:Triazoles / Q000494:pharmacology; D065819:Voriconazole
chemical_list: D011743:Pyrimidines; D011933:Reagent Kits, Diagnostic; D014230:Triazoles; D017964:Itraconazole; D000666:Amphotericin B; D015725:Fluconazole; D005437:Flucytosine; D065819:Voriconazole