It is likely that A. ustus is one of the most widely spread species of Aspergillus. It has been isolated from diverse soils from around the world, salt marshes, estuaries, foods, bat caves and uranium mines. Sporulation of A. ustus is stimulated by light. This species produces several mycotoxins and has been responsible for endocarditis and infections of the lungs and skin. It is possible that infection by A. ustus is nosocomial, but diagnoses of this mycosis are rare.
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