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Wangiella Mold Species

Wangiella dermatitidis is a causative agent of
Phaeohyphomycosis and Paracoccidioidomycosis

(Information from www.doctorfungus.org @ 2005)

 

 

Taxonomic Classifications

 

Kingdom: Fungi

Order: Chaetothyriales

Genus: Wangiella

Wangiella Mold Pictures

wangiella microscopic morphology

(Image Courtesy of www.doctorfungus.org @ 2005)

Microscopic morphology of Wangiella dermatitidis showing flask - shaped to cylindrical phialides without distinctive collarettes.  Cultures grow at 42C.

 

Wangeilla colony morphology

(Image Courtesy of www.doctorfungus.org @ 2005)

 

Colony composed of both budding yeast and hyphae on Sabouraud glucose agar.

 

 

Wangeilla infection

(Image Courtesy of www.doctorfungus.org @ 2005)

 

Clinical slide of subcutaneous phaeohyphomycosis following a non - penetrating injury. The lesion, on the dorsum of the right thumb, was fluctuant, tender, blue - gray and had no connection to the surface.

 

Ecology

Wangiella is a dematiaceous, cosmopolitan saprobic fungus that inhabits the soil and plant material.  Wangiella species is an occasional agent of various infections in humans.

 

Species

The only species classified under the genus Wangiella is Wangiella dermatitidis.   However, the taxonomic position of this species is not totally consistent as some authorities would classify it in the genus Wangiella as Wangiella dermatitidis, others would prefer to classify it in the genus Exophiala as Exophiala dermatitidis.

 

Pathogenicity and Health Effects

Wangiella dermatitidis is considered as an occasional agent of subcutaneous phaeohyphomycosis and of disseminated infection in the immunocompromised patient at times.  The infection is usually subsequent to the traumatic implantation of the fungus into the dermis, and the fungus normally remains localized.  Wangiella dermatitidis is a neurotropic fungus.  Infections in the central nervous system and as well as cases of keratitis, otitis, pneumonia, and endocarditis have been reported.  In animals, Wangiella dermatitidis may cause bovine abortion and still birth.

 

Macroscopic Appearance

     Growth rate is slow and colonies are initially moist, shiny, yeast like becoming velvety around the periphery after incubation at 25C;

     The surface colony color is black to olive black and as well as on the reverse;

     Aerial hyphae develop after three to four weeks of incubation; and

     Wangiella dermatitidis has the ability to grow at high temperatures, as high as 42C and does not assimilate potassium nitrate. 

 

Microscopic Appearance

      Septate brown hyphae, conidiophores, phialides, and yeast cells are present;

      Brown, budding, yeast like cells are dominant in young culture when examined microscopically but as the culture gets older, hyphae and phialides are formed from these yeast like cells;

      Phialides are brown, branched, flask shaped to cylindrical, and without collarettes;

      Conidiophores are commonly difficult to differentiate from vegetative hyphae; and

      Conidia are unicellular, brown, round - to oval shaped, with size ranging from 2 4 x 2.5 6 m, and are found in clusters at the tips of the phialides and down the sides of the conidiophores;

      The difference between Exophiala species and Wangiella dermatitidis is that the former produces annellides while the latter produces phialides.  However, it must also be noted that annellide production has been observed in some isolates of Wangiella dermatitidis.

 

Laboratory Precautions

General laboratory precautions are required, no special safety measures needed.

 

Susceptibility
Very limited data are available with regards to the susceptibility activity of Wangiella dermatitidis.  It is observed that amphotericin B, itraconazole, terbinafine, and voriconazole are active in vitro against Wangiella dermatitidis and voriconazole yields lower MICs compared to itraconazole. 

Surgical excision appears as the preferred treatment in cases with subcutaneous infection.  Amphotericin B alone or in combination with ketoconazole and rifampin has also been used.  However, best medical treatment of Wangiella infections is not well known.
 

The mycological information gathered and
organized in this extensive research on different
Pathogenic Molds was sourced out from the list of
informative websites and reference below:
http://www.osha.gov
http://www.doctorfungus.org
http://www.mycology.adelaide.edu.au
http://www.mycology.adelaide.edu.au

http://www.dehs.umn.edu
http://www.mold-help.org
http://www.mycology.net
http://www.clinical-mycology.com
http://www.botany.utoronto.ca
http://www.med.sc.edu
http://www.tigr.org
http://www.pangloss.ucsfmedicalcenter.org
http://www.dermnz.org
http://ncbi.nlm.nih.gov
http://www.wadsworth.org
http://botit.botany.wisc.edu

A Clinical Laboratory Handbook:
Identifying Filamentous Fungi by
St. Germain, Guy and R. Summerbell.

 

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