Journal
JOURNAL OF FUNGI
Volume 8, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/jof8070757
Keywords
dermatophytoses; tinea corporis; tinea cruris; tinea faciei; terbinafine resistance; Itraconazole; Trichophyton mentagrophytes; anthropophilic; antifungal; ITS sequencing
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T. indotineae is a newly identified dermatophyte species that has spread in an epidemic form on the Indian subcontinent. It causes inflammatory and itchy dermatophytosis and displays resistance to terbinafine, with itraconazole being the most effective treatment.
Trichophyton (T.) indotineae is a newly identified dermatophyte species that has been found in a near-epidemic form on the Indian subcontinent. There is evidence of its spread from the Indian subcontinent to a number of countries worldwide. The fungus is identical to genotype VIII within the T. mentagrophytes/T. interdigitale species complex, which was described in 2019 by sequencing the Internal Transcribed Spacer (ITS) region of ribosomal DNA of the dermatophyte. More than 10 ITS genotypes of T. interdigitale and T. mentagrophytes can now be identified. T. indotineae causes inflammatory and itchy, often widespread, dermatophytosis affecting the groins, gluteal region, trunk, and face. Patients of all ages and genders are affected. The new species has largely displaced other previously prevalent dermatophytes on the Indian subcontinent. T. indotineae has become a problematic dermatophyte due to its predominantly in vitro genetic resistance to terbinafine owing to point mutations of the squalene epoxidase gene. It also displays in vivo resistance to terbinafine. The most efficacious drug currently available for this terbinafine-resistant dermatophytoses, based on sound evidence, is itraconazole.
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