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Aspergillus flavus
Wed, 08/19/2009 - 10:52 — aemtek
Genus:
Aspergillus
Species:
flavus
Distribution:
Distributed worldwide, more common in tropical and subtropical regions.
Substrate:
Saprophytic in soil and on decaying organic materials, common as "storage fungi" occurring on stored cereal grains and foods.
Dispersal:
Conidia or chains of conidia easily become airborne and are dispersed by wind.
Indoor Occurance:
Rarely growing on building materials, occasionally found on damp walls, wallpaper, house dust, wooden flooring, particle board, food material. Minimum moisture content in equilibrium with a relative humidity of 85% is required for A. flavus growth. This
Allergenicity:
Allergenic. (see record 6)
Pathogenicity:
Opportunistic pathogen causing pulmonary infection in immunocompromised people. Also associated with sinusitis and onychomycosis. Common causative agent of aspergillosis.
Notes On Identification:
Not distinctive on spore trap samples. Genus can be identified on surface or bulk samples if the entire sporulating structure is present. Species identification requires mycological examination of aporulating cultures or molecular methods.
Spore Types:
Conidia mostly 3-5 µm in diameter, light yellowish green, globose to subglobose, roughened or echinulate, in chains.