KU55933 During the stay in the hospital, blood cultures were negative while urine cultures remained positive until the patient was treated with amphotericin B. The patient’s isolates were controlled in an outpatient mode up to the end of 2008, at which time the patient went to another

institution and no more samples were taken. The written informed consent was sought and obtained from the patient according to Spanish regulations at that date. The patient also signed his consent to the release of his clinical and personal information in a scientific publication. Antifungal susceptibility testing Antifungal susceptibilities were tested in vitro according to the EUCAST microdilution method (AFST-EUCAST, definitive document 7.1). Interpretative breakpoints proposed by EUCAST for fluconazole and Selleck ��-Nicotinamide voriconazole were used [23]. For the rest of the antifungal tested, the Selleck PF01367338 breakpoints

proposed by Rodriguez-Tudela et al. were used [24]. The antifungal agents used were amphotericin B, flucytosine, fluconazole, itraconazole, voriconazole, posaconazole, caspofungin, micafungin, and anidulafungin. Isolates were stored at −20°C until use. Selection of resistant population In February of 2011, the isolates available in our culture collection (Tables 1 and 2) were subcultured for genotyping studies. To analyze the probability of the coexistence of fluconazole resistant and susceptible populations in each isolate, we

performed a screening assay based on a single-concentration fluconazole test [25]. The antifungal concentration used in this assay was selected on the basis of the MIC values previously obtained. The test of growth was performed in microplates containing RPMI 1640 medium supplemented with 2% glucose (Sigma-Aldrich, Madrid, Spain) and a final fluconazole concentration of 8 and 16 mg/l. Ten colonies of each isolate were tested. For each Ureohydrolase colony, a suspension of 105 cfu/ml was prepared. Plates were inoculated with 0.1 ml from the cell suspension. A growth control was also included. The Optical Density (OD) at 530 nm was measured after 24 and 48 hours of incubation. The reduction of the OD below 50% compared to control was considered as susceptibility to fluconazole. Table 2 Intercolony fluconazole susceptibility in single concentration microdilution plates   No of colonies fluconazole resistant Strain 8 mg /l 16 mg/l CNM-CL-6188 2/10 1/10 CNM-CL-6361 5/10 4/10 CNM-CL-6373 9/10 9/10 CNM-CL-6399 10/10 4/10 CNM-CL-6431 2/10 2/10 CNM-CL-6488 0/10 0/10 CNM-CL-6714 4/10 4/10 CNM-CL-7019 0/10 0/10 CNM-CL-7020 0/10 0/10 CNM-CL Yeast Collection of the Spanish National Center for Microbiology. Genotyping studies Nine representative strains isolated from the patient on different days were selected for performance of genotyping studies (Tables 1 and 3).