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Paper Information

Journal:   IRANIAN JOURNAL OF MICROBIOLOGY   FEBRUARY 2016 , Volume 8 , Number 1; Page(s) 36 To 46.
 
Paper: 

ANTIFUNGAL SUSCEPTIBILITY AND VIRULENCE FACTORS OF CLINICALLY ISOLATED DERMATOPHYTES IN TEHRAN, IRAN

 
 
Author(s):  AFSHARI MOHAMMAD ALI, SHAMS GHAHFAROKHI MASOOMEH*, RAZZAGHI ABYANEH MEHDI
 
* PHD, DEPARTMENT OF MYCOLOGY, FACULTY OF MEDICAL SCIENCES, TARBIAT MODARES UNIVERSITY, 14115-331 TEHRAN, IRAN
 
Abstract: 

Background and Objectives: Dermatophytes possess a wide array of virulence factors and various antifungal susceptibility patterns which influence their pathogenesis in humans and animals. The aim of this study was to evaluate antifungal susceptibility and keratinase and proteinase activity of 49 dermatophyte strains from the genera Microsporum, Trichophyton and Epidermophyton which were isolated from human cases of dermatophytosis.
Materials and Methods: Forty-nine dermatophyte strains isolated from clinical samples were cultured on general and specific culture media. Keratinase and proteinase activity was screened on solid mineral media and confirmed in liquid cultures. Drug susceptibility toward azoles (fluconazole, ketoconazole and itraconazole), griseofulvin and terbinafine was evaluated using disk diffusion method on Mueller-Hinton agar and minimum inhibitory concentrations (MICs) were determined using microbroth dilution assay according to the Clinical and Laboratory Standards Institute (CLSI) guidelines.
Results: Our results indicated that clinically isolated dermatophytes from 7 major species produced keratinase and proteinase at different extents. The mean keratinase and proteinase activity was reported as 6.69±0.31 (U/ml) and 2.10±0.22 (U/ml) respectively. Disk diffusion and microbroth dilution (MIC) results of antifungal susceptibility testing showed that ketoconazole was the most effective drug against Epidermophyton floccosum and Trichophyton mentagrophytes, itraconazole against T. rubrum and E. floccosum, and griseofulvin and terbinafine against Trichophyton verrucosum. Our results showed that all dermatophyte isolates were resistant to fluconazole. Overall, ketoconazole and itraconazole were the most effective drugs for all dermatophyte species tested.
Conclusion: Our results showed that antifungal susceptibility testing is an urgent need to select drugs of choice for treatment of different types of dermatophytosis and further indicated the importance of keratinase and proteinase in pathogenesis of dermatophyte species.

 
Keyword(s): DERMATOPHYTES, ANTIFUNGAL SUSCEPTIBILITY TESTING, KERATINASE ACTIVITY, PROTEINASE ACTIVITY, VIRULENCE FACTORS
 
 
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APA: Copy

AFSHARI, M., & SHAMS GHAHFAROKHI, M., & RAZZAGHI ABYANEH, M. (2016). ANTIFUNGAL SUSCEPTIBILITY AND VIRULENCE FACTORS OF CLINICALLY ISOLATED DERMATOPHYTES IN TEHRAN, IRAN. IRANIAN JOURNAL OF MICROBIOLOGY, 8(1), 36-46. https://www.sid.ir/en/journal/ViewPaper.aspx?id=510683



Vancouver: Copy

AFSHARI MOHAMMAD ALI, SHAMS GHAHFAROKHI MASOOMEH, RAZZAGHI ABYANEH MEHDI. ANTIFUNGAL SUSCEPTIBILITY AND VIRULENCE FACTORS OF CLINICALLY ISOLATED DERMATOPHYTES IN TEHRAN, IRAN. IRANIAN JOURNAL OF MICROBIOLOGY. 2016 [cited 2021July25];8(1):36-46. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=510683



IEEE: Copy

AFSHARI, M., SHAMS GHAHFAROKHI, M., RAZZAGHI ABYANEH, M., 2016. ANTIFUNGAL SUSCEPTIBILITY AND VIRULENCE FACTORS OF CLINICALLY ISOLATED DERMATOPHYTES IN TEHRAN, IRAN. IRANIAN JOURNAL OF MICROBIOLOGY, [online] 8(1), pp.36-46. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=510683.



 
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