Aw:0.82; Optimum 0.97. Conidia dimensions: 2–3.5 microns. Major cause of aspergillosis. This organism causes both invasive and allergic aspergillosis. Aspergillosis affects individuals who are immune compromised. It is considered a human pathogen. It grows well at 35 °C. It is commonly found outdoors in compost piles with temperatures higher than 40 °C, and in mild to warm soils and on cereals.