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Beauveria Mold Species

Beauveria is a causative agent of Keratitis and Pneumonia among immunocompromised patients.

(Information from  A Clinical Laboratory Handbook: Identifying Filamentous Fungi)

Taxonomic Classifications

 

Kingdom: Fungi
Phylum: Ascomycota
Class: Euascomycetes
Order: Clavicipitales

Genus: Beauveria

 

 

Beauveria Mold Picture

 

Beauveria species microscopic photo from doctor fungus

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

 

Take note of the microscopic morphology of Beauveria bassiana showing the sympodial development of single - celled conidia on a geniculate or zig - zag rachis, the sympodially proliferating flask - shaped conidiogenous cells, and the hyaline and globose - or ovoid - shaped conidia.

 

 

Ecology

 

Beauveria species are cosmopolitan and are isolated from plant debris, from soil and from parasitized insects.  Beauveria species are also isolated from foodstuff, and indoor air environment.  Beauveria bassiana is a well known etiologic agent of the devastating muscardine disease of the silkworm.

 

Species

 

The genus Beauveria contains several species; however, the most common ones are Beauveria bassiana and Beauveria alba.

 

 

Pathogenicity and Health Effects

 

Beauveria is rarely responsible for infection in humans or animals.  It may be associated with keratitis.  Aside from the mentioned infection, a case of pneumonia in an immunocompromised patient due to Beauveria has also been reported.  Certain Beauveria species are important pathogens of insects. 

 

 

Macroscopic Appearance

 

     Growth rate is moderately rapid with a colony diameter ranging from 1 to 3 centimeters;

     The colony texture is cottony to powdery to mealy; and

     Color is white becoming yellowish white or pale pinkish while pale on the reverse.

 

 

Microscopic Appearance

 

      The hyphae are hyaline, narrow and septate;

      Conidiogenous cells on the hyphae are inflated at the base and are typically flask shaped and terminates in a thin zigzagging filament;

      Conidia are produced from each bending point of the filament, this type of conidium production is called sympodial geniculate growth;

      Conidia are hyaline, one celled and globose to ovoid in shape and diameter ranges from 2 to 4 m;

      The conidiogenous cells tend to form dense clusters which appear as small powdery balls in the aerial hyphae when viewed under a dissecting microscope; and

      Examination of young cultures is optimal for detailed microscopic view since the cluster formation makes it difficult to visualize the arrangement and structure of conidia.

 

 

Laboratory Precautions

 

Only general laboratory precautions are required, no special safety measures needed.

 

 

Susceptibility

 

No available data.

 

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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 book 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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