Aspergillus fumigatus is a type of fungus that is commonly found in soil and decaying plant matter. It has been known to cause respiratory infections in humans and animals. Some synonymous terms for Aspergillus fumigatus include Aspergillus niger, Aspergillus flavus, and Aspergillus terreus. These fungi are all members of the Aspergillus genus and may cause similar infections in humans. Aspergillosis, the disease caused by Aspergillus fumigatus, can range from mild to severe and may affect people with weak immune systems. Proper cleaning and ventilation practices can help prevent the growth and spread of Aspergillus fumigatus.