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Understanding Alternaria Mold with Environmental Mold Service

Environmental Mold Service

Updated: Oct 24, 2024

Allergenic Reactions & Potential Toxicity

  • Associated with Type I allergies, including hay fever and asthma.

  • Type III hypersensitivity reactions, such as woodworker's lung and apple store hypersensitivity, may occur. Cross-reactivity with other fungi like Ulocladium, Stemphylium, and Phoma has been observed.

Toxin Production 

  • A. alternata is known to produce alternariol, an antifungal compound.

Environmental Growth

  • Commonly found in soil, decaying organic material, on various food items, and textiles. It acts as a plant pathogen, particularly affecting weakened plants.

  • Grows on diverse substrates.

Physical Characteristics

  • Grows robustly on standard fungal media. Colonies appear dark olive green to brown, with a floccose to velvety texture due to heavy sporulation. Over time, colonies may become pleomorphic and lose their ability to sporulate after multiple transfers.

Potential as an Opportunistic Pathogen

  • Known to cause nasal and subcutaneous lesions, as well as nail infections, primarily in individuals with pre-existing health conditions or those on immunosuppressive medications.

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