Hortaea werneckii (Horta) Nishim. & Miyaji, Japanese Journal of Medical Mycology 26 (2): () [MB#]. Hortaea werneckii is a dematiaceous yeast that inhabits the soil, particularly in tropical and subtropical climates. It is halophilic and has also been isolated from . Abstract. During a survey of black yeasts of marine origin, some isolates of Hortaea werneckii were recovered from scuba diving equipment, such as silicone .

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Journal of Dermatology A homothallic mating locus was found in all sequenced genomes, although one of the mating genes may have been inactivated in some strains. Direct inspection of some silicone rubber and plastic samples showed what appeared to be black fungal microcolonies Fig.

These yeasts were unambiguously identified by phenotypic and genotypic methods. All adults were farmers. Methods for DNA extraction werneckiu sequencing were those of Badali et al. It is considered a commensal that shows lipophilic adhesion to human skin and survives by the assimilation of excretion products [ 32 ].

It is an infrequent, asymptomatic infection, limited to tropical and subtropical countries. British Journal of Dermatology Subsequently, follow-up of patients was performed for 1—2 mos after application of the last dose. Receive exclusive offers and updates from Oxford Academic. It is known to be phylogenetically affiliated to the order Capnodiales Crous et al.


Tinea nigra by Hortaea werneckii, a report of 22 cases from Mexico

The occurrence of this fungus in Spain is also an unexpected finding because cases of tinea nigra in this country are practically not seen. Clinical and Experimental Dermatology Studies in Mycology Summary of treatment of tinea nigra.

CPMexico Find articles by A. Role of werndckii stress in the extremely salt-tolerant yeast Hortaea werneckii. The BigDye Terminator v3.

An Applied Biosystems mod. Conidia appear as pigmented yeast cells with a dark central septum, the outer wall later becoming thick-walled, heavily pigmented.

Course of the infection according to our data was 1—18 mos, with a mean incubation time of 3. No keratinolysis can be observed and the adhesion to human hands is to be wwrneckii by the hydrophobic character of the yeast cells.

They are initially black with a creamy appearance and later become filamentous. This Add-on is available at http: The authors alone are responsible for the content and the writing of the paper.

Eleven cases were treated with Whitfield ointment. The nucleotide sequences of the ITS Handbook of Tropical Dermatolog y.

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However, other black yeasts hortaae been isolated from silicone seals in the shower room wsrneckii a hospital ward [ 23 ] or from rubber seals of the doors of dishwashers in private homes [ 24 ]. Sanctioned by Sanctioning name Validated by Type specimen or ex type More specimens Human hirtaea code Plant pathogenicity code Code toxicity.


The identification of the H. Nutritional pattern and eco-physiology of Hortaea werneckiiagent of human tinea nigra. Osmotic adaptation of the halophilic fungus Hortaea werneckii: Sequences were compared using a black yeast molecular database maintained at the Centraalbureau voor Schimmelcultures, Utrecht, The Netherlands.

Google Wikimedia Wikipedia Wikispecies. The lesions are invariably flat, not elevated and without inflamed margins; they consist of pigmented, mostly brownish, irregular and asymptomatic macules and with well-defined borders, and are covered by fine scaling. You may not use this work for commercial purposes.

Any of the above conditions can be waived if you get permission from the copyright holder. CPMexico Find articles by L. Six samples of wet granitic sand in contact with sea water were also aseptically collected from the bay where the boat was moored.

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