The aflatoxins, ochratoxins and sterigmatocystin are the principal mycotoxins of Aspergillus spp. that are known to occur naturally in levels sufficient to be regarded as significant hazards to animal and human health. Adequate research has not been done to allow generalizations concerning the other 27 or more mycotoxins of Aspergillus spp. However, the widespread and frequent occurrence of toxigenic isolates of these fungi in feed and food materials indicates that concern is justified, and these fungi and their mycotoxins must be considered hazards until proven otherwise.

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