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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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Conidia finally germinate with hyphae resulting in yeast-like colonies that gradually change over into filaments to complete the anamorph life cycle.

Cladosporium rietmanni Sartory, Rev. Support Center Support Center. Adaptation of extremely halotolerant black yeast Hortaea werneckii to increased osmolarity: A homothallic mating locus was found in all sequenced genomes, although one of the mating genes may have been inactivated in some strains.

Predisposing factors associated with tinea nigra are hyperhydrosis and exposure in coastal sea areas or hypersaline environments, where the causative agent may be acquired from the natural habitat [ 5 ]. More on this topic Cladophialophora saturnica sp.

Hortaea werneckil Horta Nishim. Most typically, it affects palms of hands but is occasionally found on other parts of the body. You are free to share – to copy, distribute and transmit the work, under the following conditions:.

The purified product was used as a template for sequencing. Fungal infection and mesomycetozoea B35—B49— Exophiala werneckii Horta Arx, The genera of fungi sporulating in pure culture: No teleomorph of this fungus has been found.

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This morphological transition is characteristic for H. The clinical location of tinea nigra was the palms in most cases; in 17 out of 18 cases the infection was unilateral and one was bilateral Figs 2A—C. Most browsers are initially set up to accept cookies, since this is required by most website owners in order to access their sites.

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Tinea nigra is considered a rare disease. Badali3, 4, 5 G. Views Read Edit View history.

Most cases are unilateral but also bilateral infections can be observed Tseng et al. The two cases located on the plantar region were also informative, as they concerned patients with the hottaea of running barefoot along the seaside, an environment with high salinity and probably the natural niche of the fungus.

Tinea nigra is an uncommon discolouration of the skin.

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Sign In or Create an Account. Oxford University Press is a department of the University of Oxford. Archived from the original on Fierro2 and R. The disorder has longtime been regarded as an infection and therefore Hortaea werneckii was classified as a BioSafety Level 2 organism Anon 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.

Facultative or heterotypic synonyms: Japanese Journal of Medical Mycology. Tinea nigra secondary to Exophiala werneckii responding to itraconazole. Six samples of wet granitic sand in contact with sea water were also aseptically collected from the bay where the boat was moored.

The authors report no conflicts of interest. Table 1 shows the strain numbers and the main demographical data of the patients. Delimiting Cladosporium from morphologically similar genera. Open in a separate hortaeaa.

The majority of patients were without apparent specific predisposing factors for fungal infection. Abstract Tinea nigra is a superficial mycosis caused by Hortaea werneckii.


By using this site, you agree to the Terms of Use and Werenckii Policy. Simple search Basic search Advanced search Search type specimens Search thesaurus Search bibliography. Similarly, fungi that colonize silicone masks, straps and snorkel mouthpieces could gain access by skin and mucous membranes maceration or through the werneckij system during scuba diving activities. Most cases in our study resolved with topical therapy within two weeks.

It is an infrequent, asymptomatic infection, limited to tropical and subtropical countries. Encyclopedia of Life EOL. Related articles in Web of Science Google Scholar.

Filamentous isolates may be mistaken for some chaetothyrialean fungi or for Cladosporium spp. Tinea nigra by Hortaea werneckiia report of 22 cases from Mexico.

In all cases, the obtained isolates were morphologically identified as Hortaea werneckii and the identification of ten isolates was retrospectively confirmed with the help of sequences of the internal transcribed spacer regions of the ribosomal DNA. Direct KOH examinations provide us with quick information and demonstrate the short, tortuous, thick, light brown hyphae, which may occasionally be darkened, and sometimes present short filaments and yeast-like cells.

Hortaea werneckii – Wikipedia

Cruz2 J. Cure was defined as the absence of clinical signs and negative culturing Table 2. We evaluate retrospectively twenty-two confirmed cases of tinea nigra from a total of eleven yr — and discuss the epidemiology, clinical features and treatment of this disease.