Some members of Aspergillus group are recognized health hazards and are of great concern if they appear in built environment. The most important species as concerns health are Aspergillus clavatus, Aspergillus fumigatus, Aspergillus niger and Aspergillus versicolor. Aspergillus clavatus is often associated with allergic diseases in workers of malt-houses. Aspergillus fumigatus is the most important and well known potential pathogen for humans with weak immunity. It is of great concern in hospital environments. Spores of Aspergillus fumigatus are allergenic and have the ability to bind on lung epithelium in asthmatic individuals, causing further complications in the health status of these patients. Due to their small size, about 70% of Aspergillus fumigatus spores are able to penetrate into the trachea and primary bronchi. Aspergillus niger and Aspergillus fumigatus are often associated with a disease condition called invasive aspergillosis. Aspergillus versicolor is one of the most common Aspergillus species found in damp indoor environments and is a major producer of one of the liver damaging and carcinogenic Mycotoxin.
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