This fungus can be found throughout the world on and in plants, soils, textiles and foods. A. alternata is among the most commonly observed molds in indoor environments, and its spores are released diurnally. It is found frequently in moist/humid areas such as watertanks and humidifiers. However, this species is also quite common in dry areas including dust from floors and mattresses. This species produces several allergens and mycotoxins (tenuazonic acid and altertoxins). Members of the genus Alternaria are known to cause asthma, sinusitis and infections of the eyes, ears and skin.
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