Characteristics: Allergen Type I and Type III also considered to be pathogenic and toxigenic.

Description: Alternaria in one of the most common fungi worldwide. Its colonies are generally found in soil, dead organic debris, on food stuffs, textiles, and weakened plants with a dark olive green to brown coloration with velvety texture. It is disseminated as a dry spore through the wind. Most species of Alternaria do not grow at 37° C. As an allergen, it has been known to cause both Type I and Type III symptoms. As a pathogen it has been known to cause nasal lesions, subcutaneous lesions, and nail infections. The majority of infections occur in people with underlying disease or in those taking immunosuppressive drugs. As a toxigenic agent, it produces alternariol (an antifungal), AME (metabolite), tenuazonic acid, and altertoxins. It can be used for biocontrol to kill weeds and plants.

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