Antifungal susceptibility testing of Candida species isolated from the immunocompromised patients admitted to ten university hospitals in Iran: comparison of colonizing and infecting isolates

Date
2017-11-21
Authors
Badiee, Parisa
Badali, Hamid
Boekhout, Teun
Diba, Kambiz
Moghadam, Abdolkarim Ghadimi
Hossaini Nasab, Ali
Jafarian, Hadis
Mohammadi, Rasoul
Mirhendi, Hossein
Najafzadeh, Mohammad Javad
Journal Title
Journal ISSN
Volume Title
Publisher
BMC
Abstract

Background: Antifungal susceptibility testing is a subject of interest in the field of medical mycology. The aim of the present study were the distributions and antifungal susceptibility patterns of various Candida species isolated from colonized and infected immunocompromised patients admitted to ten university hospitals in Iran.

Methods: In totally, 846 Candida species were isolated from more than 4000 clinical samples and identified by the API 20 C AUX system. Antifungal susceptibility testing was performed by broth microdilution method according to CLSI.

Results: The most frequent Candida species isolated from all patients was Candida albicans (510/846). The epidemiological cutoff value and percentage of wild-type species for amphotericin B and fluconazole in Candida albicans, Candida tropicalis, Candida glabrata and Candida krusei were 0.5 μg/ml (95%) and 4 μg/ml (96%); 1 μg/ml (95%) and 8 μg/ml (95%); 0.5 μg/ml (99%) and 19 μg/ml (98%); and 4 μg/ml (95%) and 64 μg/ml (95%), respectively. The MIC90 and epidemiological cutoff values to posaconazole in Candida krusei were 0.5 μg/ml. There were significant differences between infecting and colonizing isolates of Candida tropicalis in MIC 90 values of amphotericin B, and isolates of Candida glabrata in values of amphotericin B, caspofungin, and voriconazole (P < 0.05).

Conclusions: Our findings suggest that the susceptibility patterns of Candida species (colonizing and infecting isolates) in immunocompromised patients are not the same and acquired resistance was seen in some species.

Description
Keywords
colonizing Candida, Candida infected patients, Candida wild-type, Candida susceptibility testing, Candida albicans
Citation
Badiee, P., Badali, H., Boekhout, T., Diba, K., Moghadam, A. G., Hossaini Nasab, A., . . . Soltani, J. (2017). Antifungal susceptibility testing of Candida species isolated from the immunocompromised patients admitted to ten university hospitals in Iran: comparison of colonizing and infecting isolates. BMC Infectious Diseases, 17(1), 727. doi:10.1186/s12879-017-2825-7
Department
Molecular Microbiology and Immunology