Aspergillus is a group of about 200 species of molds found worldwide. About 16 species are dangerous to humans, causing disease. Most common in environment, grows on damp walls and decaying vegetation
Aspergillus flavus is the main aflatoxin-producing species. Aflatoxins are low molecular weight compounds with blue or green fluorescence. AFB1 is carcinogenic to humans, AFM1 possibly carcinogenic, AFG1 not carcinogenic