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Stachybotrys Mould


Stachybotrys is a greenish and solid black mold that grows on material with a high cellulose content or such as hay, straw, wicker, and wood chips, as well as building materials such as ceiling tile, drywall, paper vapor barriers, wallpaper, insulation backing, cardboard boxes, paper files, fiberboard, the paper covering of gypsum wallboard, particleboard, jute, dust, and wood when these items become water damaged. This mold requires very wet or high humidity and condensation conditions for days or weeks in order to grow. Most mold spores can begin growing after just 24 hours of wetness, whereas Stachybotrys spores take at least 48 hours of sustained wetness to begin growth, Stachybotrys can look black, shiny, and slimy. (Enviro Test Laboratories)

  In 1986, Croft et al. reported an outbreak of trichothecene toxicosis in a Chicago home. Over a 5-year period, the family complained of headaches, sore throats, flu-like symptoms, recurring colds, diarrhea, fatigue, dermatitis and general malaise.  Air sampling of this home revealed spores of Stachybotrys. The fungus was found growing on moist organic debris in an uninsulated cold air duct and on some wood fibber ceiling material. The home had a chronic moisture problem that favored mold growth. Extracts from the duct debris and contaminated building materials were toxic to test animals and several macro cyclic trichothecenes were identified in the extracts. When the mold problem was corrected, these symptoms associated with trichothecene toxicosis disappeared. (Enviro Test Laboratories)

    Aspergillus mould


    Aspergillus mould is prevalent under a variety of moisture conditions as a contaminant on almost any outdoor or indoor surface.   Aspergillus colonies are downy to powdery in texture. The surface color may vary depending on the species. The reverse is uncolored to pale yellow in most of the isolates. However, reverse color may be purple to olive in some strains of Aspergillus nidulans and orange to purple in Aspergillus versicolor

 Based on the research conducted by the National Center for Biotechnology Information (NCBI), Aspergillus fumigatus can also cause allergic bronchopulmonary and sinus infections. Patients with asthma and cystic fibrosis can frequently develop allergic broncho-pulmonary aspergillosis (ABPA), a hypersensitivity reaction to the fungus Aspergillus fumigatus, which frequently leads to a progressive loss in lung function.(Enviro Test Laboratories) 

  Penicillium mould          


Colonies are usually fast growing, in shades of green, sometimes white, mostly consisting of a dense felt of conidiophores. The colonies of Penicillium other than Penicillium marneffei are rapid growing, flat, filamentous, and velvety, woolly, or cottony in texture. The colonies are initially white and become blue green, gray green, olive gray, yellow or pinkish in time. The plate reverse is usually pale to yellowish.

Penicillium marneffei is thermally dimorphic and produces filamentous, flat, radially sulcate colonies at 25C. These colonies are bluish-gray-green at center and white at the periphery. The red, rapidly diffusing, soluble pigment observed from the reverse is very typical. At 37C, Penicillium marneffei colonies are cream to slightly pink in color and glabrous to convoluted in texture. (Enviro Test Laboratories)

Other sources of information are Workplace Safety and Health Division guidelines for mould in the workplace.

Environmental Science & Engineering  

Canada Mortgage and Housing Corp.

mould information

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