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Showing 2 results for Dermatophyte
The Use Of PCR To Diagnose Onychomycosis Caused By Non-Dermatophytic Molds
Bahram Ahmadi, Sasan Rezaei, Farshad Hashemi, Mahdi Zareei, Hoda Deli, Seyed Jamal Hashemi,
Volume 9, Issue 4 (11-2015)
Abstract

Background and Aim: Onychomycosis or nail fungus infection has an increasing prevalence with many effects on patients’ social life and mental health dermatophytes, yeasts and non-dermatophyte molds are among the best known agents of fungal infections of nails. The purpose of this study was to determine the prevalence of non-dermatophyte molds using morphological (direct examination and culture) and molecular (PCR) methods in patients referring to Medical Sciences Mycology Laboratory in Tehran, Iran.

Materials and Methods: In this study, samples were taken from 170 patients. For direct microscopic examination (DME), 15% KOH solution was used for the culture of samples, Sabouraud dextrose agar media (S) was applied together with chloramphenicol (SC) and chloramphenicol and cycloheximide (SCC). Meanwhile, differential tests were done for mycological diagnosis (slide culture), and 28SrDNA amplification and sequencing were performed for suspect or unknown samples.

Results: Of the 170 patients, 74 cases (43.5%) had onychomycosis, of which 53 cases (71.62%) were female and 21 cases (28.38%) were male. Also, of the 74 cases of onychomycosis, 40 cases (54.05%) were reported candidiasis, 21 cases (28.37%) non-dermatophyte molds, and 12 cases (16.21 %) dermatophytes.

Conclusion: The prevalence of onychomycosis in this study was 43.5% and the application of polymerase chain reaction (PCR) technique in cases of false positive, false negative and long-term culture was valuable meanwhile, given that all the samples that had positive results in DME with negative cultures were positive in molecular tests, this study reveals the power of molecular techniques compared with culture method.


Investigation of the Antifungal Effects of Carvacrol on Clinical Isolates of Trichophyton Rubrum
Davood Bahrami, Mahin Tavakoli, Bahram Ahmadi,
Volume 19, Issue 6 (3-2026)
Abstract
Background and Aim: Trichophyton rubrum is among the most frequently detected species that cause dermatophyte infections, especially chronic infections, so it requires early diagnosis and appropriate antifungal treatment. Due to the increasing resistance of different species of dermatophytes to antifungals, the use of herbal compounds with antifungal properties can be used as adjuvant therapy or even an alternative therapy. Carvacrol has a wide range of biological activities, including antifungal, antiviral, antibacterial, insecticidal, and antioxidant properties. Accordingly, we aimed to determine the antifungal effect of carvacrol on 12 strains of Trichophyton rubrum in comparison to the antifungal drug terbinafine in vitro. 
Materials and Methods: This investigation was conducted on Trichophyton rubrum isolates that had been previously identified morphologically and molecularly. The protocol used to perform in vitro susceptibility testing was the A38-M-CLSI standard using the Broth Microdilution method. The obtained results were analyzed using SPSS software, and the MIC50, MIC90, and GM of this compound against Trichophyton rubrum isolates were estimated compared to terbinafine.
Results: The minimum inhibitory concentration (MIC) was determined using different concentrations of carvacrol (in the concentration range of 0.25 to 2 μg/mL) and terbinafine (in the concentration range of 0.0625 to 0. 5 μg/mL). The MIC50 and MIC90 values for Carvacrol were determined to be 0. 5 and 2 μg/mL, respectively. Whereas, the corresponding values for terbinafine were calculated at 0.0625 and 0. 5 μg/mL. The GM values were 0.5 for cavacrol and 0.1 for terbinafine. Similar to terbinafine, the antifungal efficacy of the studied compound displayed significant differences against Trichophyton rubrum isolates (P-value<0.05).  
Conclusion: Although the MIC values for carvacrol were higher than those for terbinafine in vitro, it demonstrated significant antifungal activity against Trichophyton rubrum isolates. Therefore, this natural compound seems to be a good option for adjuvant therapy along with antifungals in dermatophyte infections, although the realization of this matter requires further investigation on the combined effect of carvacrol and terbinafine, determining the toxicity of carvacrol, and also examining this compound in vivo.

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