Aspergillus fumigatus is a type of fungus commonly found in the environment, particularly in soil, decaying organic matter, and compost. It is a filamentous mold that reproduces by producing spores, which can be easily inhaled. While it plays a role in breaking down organic material, it can also pose health risks, especially to individuals with weakened immune systems. In healthy individuals, Aspergillus fumigatus typically does not cause illness. However, it can lead to respiratory infections, such as aspergillosis, in vulnerable populations. Symptoms may include cough, fever, and difficulty breathing. Proper hygiene and environmental control can help reduce exposure to this fungus.